British citizenship by descent: who qualifies, the law, and what it takes

Q: Can you claim British citizenship through a parent?

Likely. A child born abroad to a British citizen born in the UK is British by descent; you may only need a passport.

Q: Can you claim British citizenship through a grandparent?

Unlikely. British citizenship does not pass to grandchildren born abroad, except where a parent was in Crown service or a historical unfairness registration applies. Applicants from outside the Commonwealth cannot use the ancestry visa either. If you were born before 1983: possible. If the grandparent is your grandmother and you were born before 1983: possible.

Q: Can you claim British citizenship through a great-grandparent?

Unlikely. British citizenship does not pass to grandchildren born abroad, except where a parent was in Crown service or a historical unfairness registration applies. Applicants from outside the Commonwealth cannot use the ancestry visa either.

Through a parentCitizen by descent (s.2)Through a grandparentOne generation onlyPossible if you were born before 1983 Through a great-grandparentOne generation only

Routes: Citizen by descent (s.2) · Registration for historical unfairness (s.4L)
Dual citizenship: Kept on every open route

The stamps assume no one in the line became a citizen of another country before the next person in the line was born. What changes each answer is below.

On this page

01Who qualifies
02Dates that matter
03Mothers’ lines
04Keeping your citizenship
05The routes and the law
06The documents
07What it takes
08Where the records live
09Former places
10Law changes
11Other doors
12Sources

01Who qualifies

Who qualifies, generation by generation

LIKELY

Can you claim British citizenship through a parent?

Citizen by descent (s.2)

A child born abroad to a British citizen born in the UK is British by descent; you may only need a passport.

A person born outside the UK is a British citizen if at the time of birth a parent is a British citizen otherwise than by descent. British Nationality Act 1981, s.2 (citizenship by descent), s.4C (registration for people born before 1983 to a British mother) and s.4L (historical unfairness), s.2

What changes the answer

LIKELY
If the parent is your mother and you were born before 1983Registration (s.4C)
Born before 1983 to a British mother, you did not get citizenship at birth, but you can register as a citizen to correct that.

UNLIKELY

Can you claim British citizenship through a grandparent?

One generation only

British citizenship does not pass to grandchildren born abroad, except where a parent was in Crown service or a historical unfairness registration applies. Applicants from outside the Commonwealth cannot use the ancestry visa either.

What would settle itWhether your parent was a British citizen otherwise than by descent when you were born (for example, born in the UK), or whether a historical-unfairness registration applies to your line.

Citizenship by descent passes only to the first generation born abroad. British Nationality Act 1981, s.2 (citizenship by descent), s.4C (registration for people born before 1983 to a British mother) and s.4L (historical unfairness), s.2
The UK Ancestry visa is for Commonwealth citizens with a UK-born grandparent; it is a work route, not citizenship. UK Ancestry visa (Immigration Rules, Appendix UK Ancestry)

What changes the answer

POSSIBLE
If you were born before 1983Registration (s.4C)
Born before 1983, you may be entitled to register as British if the line runs through your mother: had women passed on citizenship like men, a mother who was British by descent would have passed it to you.
POSSIBLE
If the grandparent is your grandmother and you were born before 1983Registration (s.4C)
Born before 1983, you may be entitled to register as British if the line runs through your mother: had women passed on citizenship like men, a mother who was British by descent would have passed it to you.

UNLIKELY

Can you claim British citizenship through a great-grandparent?

One generation only

Citizenship by descent passes only to the first generation born abroad. British Nationality Act 1981, s.2 (citizenship by descent), s.4C (registration for people born before 1983 to a British mother) and s.4L (historical unfairness), s.2
The UK Ancestry visa is for Commonwealth citizens with a UK-born grandparent; it is a work route, not citizenship. UK Ancestry visa (Immigration Rules, Appendix UK Ancestry)

02Dates that matter

The dates that matter

1949
A person born between 1949 and 1983 who would have become a citizen of the United Kingdom and Colonies had women been able to pass citizenship on the same terms as men is entitled to register as a British citizen. British Nationality Act 1981, s.4C
1978
The Supreme Court held that Shelley Romein, born in the United States in 1978 to a mother who was British by descent through a UK-born grandfather, was entitled to register; the consular-registration condition a father by descent would have faced could not be held against her. Advocate General for Scotland v Romein [2018] UKSC 6
1983
People born before 1983 who would have been British had women been able to pass citizenship on the same terms as men may register as of right under s.4C; other historical unfairness is addressed, at discretion, under s.4L. British Nationality Act 1981, s.4C
2019
Registration under s.4C carries no good character requirement since 2019. British Nationality Act 1981 (Remedial) Order 2019 (SI 2019/1164), amending s.41A

03Mothers’ lines

How mothers’ lines were treated

In United Kingdom’s rule, the answer changes when the line runs through a woman:

LIKELY
If the parent is your mother and you were born before 1983Registration (s.4C)
Born before 1983 to a British mother, you did not get citizenship at birth, but you can register as a citizen to correct that.
POSSIBLE
If the grandparent is your grandmother and you were born before 1983Registration (s.4C)
Born before 1983, you may be entitled to register as British if the line runs through your mother: had women passed on citizenship like men, a mother who was British by descent would have passed it to you.

In the law’s words

People born before 1983 who would have been British had women been able to pass citizenship on the same terms as men may register as of right under s.4C; other historical unfairness is addressed, at discretion, under s.4L. British Nationality Act 1981, s.4C
A person born between 1949 and 1983 who would have become a citizen of the United Kingdom and Colonies had women been able to pass citizenship on the same terms as men is entitled to register as a British citizen. British Nationality Act 1981, s.4C
The Supreme Court held that Shelley Romein, born in the United States in 1978 to a mother who was British by descent through a UK-born grandfather, was entitled to register; the consular-registration condition a father by descent would have faced could not be held against her. Advocate General for Scotland v Romein [2018] UKSC 6
Registration under s.4C carries no good character requirement since 2019. British Nationality Act 1981 (Remedial) Order 2019 (SI 2019/1164), amending s.41A

04Keeping your citizenship

Dual citizenship with your home country

You keep your citizenship.

On every open route, the rule lets a citizen of the United States, Canada, the United Kingdom, Australia, New Zealand, Brazil, Argentina or South Africa keep that citizenship.

Holding this citizenship alongside another is addressed by the law cited; check the current position before relying on it. British Nationality Act 1981, s.2 (citizenship by descent), s.4C (registration for people born before 1983 to a British mother) and s.4L (historical unfairness)

05The routes

Every route, and the law behind it

Citizen by descent (s.2)

Open through a parent

LIKELY
Through a parent

The law

A person born outside the UK is a British citizen if at the time of birth a parent is a British citizen otherwise than by descent. British Nationality Act 1981, s.2 (citizenship by descent), s.4C (registration for people born before 1983 to a British mother) and s.4L (historical unfairness), s.2

Registration (s.4C)

Open through a parent or a grandparent

LIKELY
Through a parent, if the parent is your mother and you were born before 1983
POSSIBLE
Through a grandparent, if you were born before 1983

The law

A person born outside the UK is a British citizen if at the time of birth a parent is a British citizen otherwise than by descent. British Nationality Act 1981, s.2 (citizenship by descent), s.4C (registration for people born before 1983 to a British mother) and s.4L (historical unfairness), s.2
People born before 1983 who would have been British had women been able to pass citizenship on the same terms as men may register as of right under s.4C; other historical unfairness is addressed, at discretion, under s.4L. British Nationality Act 1981, s.4C
A person born between 1949 and 1983 who would have become a citizen of the United Kingdom and Colonies had women been able to pass citizenship on the same terms as men is entitled to register as a British citizen. British Nationality Act 1981, s.4C
The Supreme Court held that Shelley Romein, born in the United States in 1978 to a mother who was British by descent through a UK-born grandfather, was entitled to register; the consular-registration condition a father by descent would have faced could not be held against her. Advocate General for Scotland v Romein [2018] UKSC 6
Registration under s.4C carries no good character requirement since 2019. British Nationality Act 1981 (Remedial) Order 2019 (SI 2019/1164), amending s.41A

What would settle an unsure case

Whether the link between your British grandparent and you is your mother. Through your father, a British-by-descent parent passed citizenship only if your birth was registered at a British consulate within a year.

One generation only

Closed: no open answer on this route

UNLIKELY
Through a grandparent
British citizenship does not pass to grandchildren born abroad, except where a parent was in Crown service or a historical unfairness registration applies. Applicants from outside the Commonwealth cannot use the ancestry visa either.

The law

Citizenship by descent passes only to the first generation born abroad. British Nationality Act 1981, s.2 (citizenship by descent), s.4C (registration for people born before 1983 to a British mother) and s.4L (historical unfairness), s.2
The UK Ancestry visa is for Commonwealth citizens with a UK-born grandparent; it is a work route, not citizenship. UK Ancestry visa (Immigration Rules, Appendix UK Ancestry)

What would settle an unsure case

Whether your parent was a British citizen otherwise than by descent when you were born (for example, born in the UK), or whether a historical-unfairness registration applies to your line.

06The documents

The documents, as the rule lists them

Citizen by descent (s.2)

Through a parent

Your parent's UK birth certificate
Your birth certificate
Your parents' marriage certificate

Registration (s.4C)

Through a parent, if the parent is your mother and you were born before 1983

Your parent's UK birth certificate
Your birth certificate
Your parents' marriage certificate

Through a grandparent, if you were born before 1983

Your UK-born grandparent's birth certificate
Your mother's birth certificate
Your birth certificate
Form UKM

Most countries also want proof that no one in the line became a citizen elsewhere before the next birth: the naturalization record with its date, or a letter that none exists.

07What it takes

What it takes: time, cost, the hard part, who decides

Citizen by descent (s.2)

Time: 3–8 weeks for a first British passport.
Cost: About $200: the passport fee and certified copies.
The hard part: None. You are already British; this is a passport application with your parent’s UK birth certificate.
Who decides: HM Passport Office, online.
The first record: Your parent’s UK birth certificate, from The General Register Office (England and Wales), NRS (Scotland) or GRONI (Northern Ireland). Order online with the name, year and district; £12.50, delivered in about two weeks. gov.uk

How it’s filed

Where: HM Passport Office, online from the U.S.; original documents are posted to the address HMPO gives after submission. office list
How: Online; no appearance needed
Form: HM Passport Office online application for a first adult passport from overseas
Fee: About $192
Decision: 3–17 weeks

What goes in the file (9)

Online application and fee, paid by card
Digital photo meeting HMPO rules
Identity confirmation by someone who knows the member (requested by HMPO after submission)
Member's full (long-form) birth certificate showing both parents
British parent's full UK birth certificate
Parents' marriage certificate, if the member was born before 1 July 2006 and claims through the father
British parent's passport details or old passport
Member's current non-British passport
Certified translations of any non-English document

What goes wrong (7)

This is the whole claim: a child born abroad to a parent who is British otherwise than by descent (usually UK-born) is British from birth under s.2, and the first passport is where HMPO decides entitlement.
Fee from 8 April 2026: £116.50 online international adult (£130 on paper), plus £14.32 DHL delivery of the passport and £14.32 for the secure return of supporting documents.
The attachment list is generated per applicant by HMPO's online service and was not verified item by item this pass. The marriage rule for births through a father before 1 July 2006 is from the Nationality Act.
HMPO's 3-week standard applies to UK applications only; overseas turnaround was not published on the pages checked. Widened.
Alternative: a letter confirming British citizenship from UKVI's nationality services, before or instead of a passport (fee not checked).
The member's own children born abroad do not become British automatically (citizenship by descent stops at one generation).
From CA, AU, NZ, ZA: same HMPO overseas service and fees. From GB: a UK resident applies at the UK fee (£102 online).

Checked 25 September 2026 · source ↗

Registration (s.4C)

Time: 6 months for the registration decision, then a passport.
Cost: About $250: s.4C registration itself is fee-exempt; you pay only the £130 citizenship ceremony fee plus certified copies.
The hard part: Not the fee, since s.4C is free to register. The work is documenting a British mother before 1983 and attending the citizenship ceremony.
Who decides: UK Visas and Immigration, online (Form UKM).
The first record: Your mother’s UK birth certificate, from The General Register Office. Order online; £12.50. gov.uk

How it’s filed

Where: UK Visas and Immigration (Home Office), online; documents are uploaded or scanned at the biometric appointment office list
How: Online; you appear in person
Form: Form UKM, online (register as a British citizen: born before 1983 to a British mother)
Appointments: Biometric enrolment at a UK visa application centre (VAC), operated in the U.S. by VFS Global; the appointment link comes after the online application is submitted. Enrol within 45 days of submitting or the application is invalid. No fee for biometrics. VFS Global has run the U.S. VAC network since mid-2025, replacing the earlier operator (resolves the prior open question on the U.S. operator); its centres are listed at https://visa.vfsglobal.com/usa/en/gbr/attend-centre. Standard VFS Global practice elsewhere bars automated/bulk bookings, though this was not independently confirmed for the UK's U.S. flow specifically.
Fee: About $172
Decision: 4–12 months

What goes in the file (9)

Member's passport
Member's full birth certificate naming the parents
Mother's full birth certificate
Mother's UK and Colonies naturalisation or registration certificate, adoption papers, or expired UK and Colonies passport (when her birth certificate alone does not show she was a citizen in her own right)
Marriage certificates showing any change of family name between the mother's and the member's birth certificates
If the mother was a citizen by descent: her parents' marriage certificate and her British parent's birth and naturalisation/registration certificate, or evidence of her Crown service
Declarations by two referees who have known the member for 3 years: one a professional of any nationality, one a British passport holder who is a professional or over 25; neither related
Family tree (recommended by the guidance)
Certified translations of any non-English document

What goes wrong (7)

Registration is fee-exempt for s.4C (and 4G, 4H, 4I); the only fee is the £130 citizenship ceremony (UKVI fees table, updated 8 April 2026).
Entitlement: born before 1 January 1983 to a mother who was a citizen of the UK and Colonies, where the member would have become one at birth had women passed citizenship like men (Form UKM guidance). A decision on the balance of probabilities is possible when a document is missing.
UKVI aims to decide within 6 months and writes if it will take longer.
After approval the ceremony is held at a British embassy, high commission or consulate, arranged and attended within 90 days of the invitation; missing it without good reason means refusal.
The passport comes after the ceremony, as a first adult passport from overseas.
s.4L (discretionary registration for historical unfairness or official error) covers cases s.4C's strict conditions miss. No separate s.4L application spec was written this pass: its form and fee were not verified. Route those cases to review.
From GB: biometrics at a UKVCAS service point, and the ceremony at the local council. From CA, AU, NZ, ZA, BR, AR: a VAC in that country; same form and fee.

Checked 25 September 2026 · source ↗

Estimates are honest ranges from official fee tables and what families report; where a fee or time could not be confirmed, it says so.

08Where the records live

Where each record lives, and how to ask for it

birth1837–2026
General Register Office for England and Wales (HM Passport Office), or the local register office where the birth was registered.
Search the GRO index (free account) by name, year and mother's maiden surname to get the index reference; ordering with the reference is faster and cheaper.
Ask
Online, in English · request page ↗
Search
GRO online index (free registration required)
Fee
12.5 GBP (about $17)
Takes
1–5 weeks
Good to know (3)
- £12.50, dispatched 4 days after ordering with a GRO index reference; without one, £3.50 more per search and dispatch in 15 working days. Priority £38.50, next working day. Add international post time.
- For a passport application the GRO can send the certificate straight to HM Passport Office with the PEX reference.
- Order the full certificate (showing parents); short certificates are not accepted for nationality.
Checked 25 September 2026 · source ↗
birth1855–2026
National Records of Scotland (statutory registers), ordered through ScotlandsPeople.
ScotlandsPeople search by name and year (pay-per-view credits for images; the index search itself is free with an account).
Ask
Online, in English · request page ↗
Search
ScotlandsPeople (NRS)
Fee
15 GBP (about $20)
Takes
1–6 weeks
Good to know (1)
- £15 for the first copy, £10 for each additional copy, plus postage (NRS). Turnaround to the U.S. unverified; widened.
Checked 25 September 2026 · source ↗
birth1864–2026
General Register Office for Northern Ireland (GRONI).
Ask
Online, in English · request page ↗
Search
GRONI online records (free registration required)
Fee
15 GBP (about $20)
Takes
1–4 weeks
Good to know (1)
- £15 per certificate (includes a non-refundable £7 search fee), priority £20, plus £1.20–£3.43 airmail outside Europe. GRONI aims to issue in five working days.
Checked 25 September 2026 · source ↗
marriage1837–2026
GRO (England and Wales), NRS/ScotlandsPeople (Scotland, from 1855) or GRONI (Northern Ireland), for marriages in the UK; the county or state for marriages in the U.S.
Ask
Online, in English · request page ↗
Search
GRO online index (free registration required)
Fee
12.5 GBP (about $17)
Takes
1–5 weeks
Good to know (2)
- Same prices as births: GRO £12.50, ScotlandsPeople £15, GRONI £15.
- Needed when surnames change along the chain (UKM guidance), and, for a claim through a father for a birth before 1 July 2006, to show the parents were married.
Checked 25 September 2026 · source ↗

Translations

Into: English
Who may translate: Any certified translator
About: $25–$75 a page

English records need no translation and no apostille. For a record in another language, the UKM guidance just says to 'provide any translations'. HMPO and UKVI take a full certified translation from a professional translator: the translator confirms it is accurate, dates it, and gives their name and contact details. No apostille on the translation. Per-page price is a market range, unverified.

Checked 25 September 2026 · source ↗

The passport

Where: HM Passport Office, online first adult passport application from overseas (after s.4C registration, with the registration certificate).
Fee: About $192
Time: 3–17 weeks

Checked 25 September 2026 · source ↗

09Former places

Places on old papers that lead to United Kingdom

If your family’s records name one of these, United Kingdom’s law may be the one that applies. The town decides.

Ireland (before 1922) · also Ulster, Northern Ireland
Northern Ireland is the UK; Irish law still counts anyone born on the island.
Today: Ireland, United Kingdom
Wales · also Scotland, England, Britain, Great Britain

10Law changes

Recent and pending changes

The legislative watch has no pending bill or recent ruling recorded for United Kingdom.

The watch re-reads the official pages behind this guide every day. When one changes, a person re-checks the rule before anything here moves.

11Other doors

If descent doesn’t reach you

4 residence programs lead to United Kingdom without an ancestor, each with its own law and road to citizenship.

12Sources

Every source on this page

5 laws and official pages behind the answers, then the offices and pages behind the records and filing. Records and filing checked 25 September 2026.

LawBritish Nationality Act 1981, s.2 (citizenship by descent), s.4C (registration for people born before 1983 to a British mother) and s.4L (historical unfairness) · s.2
LawBritish Nationality Act 1981, s.4C
LawUK Ancestry visa (Immigration Rules, Appendix UK Ancestry)
LawAdvocate General for Scotland v Romein [2018] UKSC 6
LawBritish Nationality Act 1981 (Remedial) Order 2019 (SI 2019/1164), amending s.41A
RecordsThe General Register Office (England and Wales), NRS (Scotland) or GRONI (Northern Ireland): Your parent’s UK birth certificate · checked 25 September 2026
RecordsHow to file: Citizen by descent (s.2) · checked 25 September 2026
RecordsHM Passport Office online application for a first adult passport from overseas · checked 25 September 2026
RecordsHow to file: Registration (s.4C) · checked 25 September 2026
RecordsForm UKM, online (register as a British citizen: born before 1983 to a British mother) · checked 25 September 2026
RecordsBiometric enrolment at a UK visa application centre (VAC), operated in the U.S. by VFS Global; the appointment link comes after the online application is submitted · checked 25 September 2026
RecordsGRO online index (free registration required) · checked 25 September 2026
RecordsBirth records, 1855–2026: National Records of Scotland · checked 25 September 2026
RecordsScotlandsPeople (NRS) · checked 25 September 2026
RecordsBirth records, 1864–2026: General Register Office for Northern Ireland · checked 25 September 2026
RecordsGRONI online records (free registration required) · checked 25 September 2026

Not legal advice. Postern’s rulebook is written from the statutes and tested against documented cases; where the law is unsettled, the answer says “possible” or “unsure” rather than guess.

Who qualifies, generation by generation

Can you claim British citizenship through a parent?

What changes the answer

Can you claim British citizenship through a grandparent?

What changes the answer

Can you claim British citizenship through a great-grandparent?

The dates that matter

How mothers’ lines were treated

In the law’s words

Dual citizenship with your home country

Every route, and the law behind it

The law

The law

What would settle an unsure case

The law

What would settle an unsure case

The documents, as the rule lists them

Citizen by descent (s.2)

Registration (s.4C)

What it takes: time, cost, the hard part, who decides

Citizen by descent (s.2)

How it’s filed

Registration (s.4C)

How it’s filed

Where each record lives, and how to ask for it

Translations

The passport

Places on old papers that lead to United Kingdom

Recent and pending changes

If descent doesn’t reach you

Every source on this page

Check your family for United Kingdom.