Citizenship Through Grandparents: Rules and Limits

The One-Generation Limit

The rule that answers most of these questions is in sections 2 and 14 of the British Nationality Act 1981. British citizenship comes in two kinds:

• Otherwise than by descent — typically someone born in the UK, or naturalised here. This kind passes to a child born abroad.
• By descent — someone who was born abroad and became British through a parent. This kind does not pass to a child born abroad.

So the usual family looks like this:

1. Grandparent, born in the UK — British otherwise than by descent.
2. Parent, born abroad — British by descent, automatically, under section 2(1)(a).
3. You, born abroad — not British, because section 2(1)(a) only works where the parent is British otherwise than by descent.

Nothing about this depends on paperwork or on anyone applying for anything. It is the shape of the Act.

The Crown Service Exception

Section 2(1)(b) is the real exception. A person born outside the UK is British if, at the time of the birth, a parent was a British citizen — of either kind — and was serving outside the UK in Crown service under the UK government, or in a description of service designated by the Secretary of State, and that recruitment took place in the UK or a qualifying territory.

The recruitment condition is the part people miss. A parent employed by the UK government but recruited locally overseas does not bring the child within it.

Registering a Child: Sections 3(2) and 3(5)

Section 3 of the Act allows a child born abroad to a parent who is British by descent to be registered. These are two different provisions with different conditions, and they are regularly mixed up.

Section 3(2)

An entitlement, on an application made while the person is a minor, where the requirements in section 3(3) are met: at the time of the birth the parent was a British citizen by descent; that parent's own parent — the child's grandparent — was a British citizen otherwise than by descent at the relevant time; and the parent had, at some point before the child was born, spent a three-year period in the UK or a qualifying territory, present at the start of it and absent for no more than 270 days across it.

Note that this is about the parent's residence before the birth, not about the family living in the UK afterwards. Registration under section 3(2) gives citizenship by descent, under section 14(1)(a).

Section 3(5)

This is the one about the family living in the UK. It applies where a parent was a British citizen by descent at the time of the birth, and the child and both parents were in the UK or a qualifying territory at the start of the three-year period ending with the application, with absences of no more than 270 days, and both parents consent. The application must be made while the person is a minor.

Section 3(5) is not listed in section 14, which means registration under it gives citizenship otherwise than by descent — so that person could pass citizenship to their own child born abroad. That is a meaningful difference between the two provisions.

Check Whether the Parent Is Already British

Citizenship by descent happens automatically at birth. Nobody has to claim it, and plenty of people have it without knowing. Before treating a parent as not British, it is worth working out whether they already are.

For births after 1 January 1983, section 2 is the test set out above. For births before then the position is governed by the British Nationality Act 1948 and the transitional provisions in the 1981 Act, which are genuinely intricate: citizenship of the United Kingdom and Colonies also passed only one generation abroad, it passed through the father and not the mother, and children of unmarried fathers were excluded. Those three features are exactly what the correction provisions below exist to address.

The Correction Provisions

Several historical rules have been corrected by later legislation. The relevant question for someone reading this page is usually not whether you can register, but whether a parent can — because if a parent becomes British otherwise than by descent, that can change your position, and if they become British by descent, it usually does not.

• Section 4C — for people born before 1 January 1983 who would have become a citizen of the UK and Colonies through their mother, had the law then allowed citizenship to pass through mothers. Section 14(1)(d) makes registration under 4C by descent.
• Sections 4E to 4I — for people born before 1 July 2006 whose mother was not married to their natural father, and who would have been British had the parents been married. Whether the result is by descent or otherwise than by descent depends on which of those sections applies and on what the person's position would have been: section 14(1)(da) makes it by descent only where sections 4F(3), 4G(2), 4H(2) or 4I(4) say so.
• Section 4L, added by the Nationality and Borders Act 2022 — a discretionary route for an adult where, in the Secretary of State's opinion, they would have been or would have been able to become British but for historical legislative unfairness, an act or omission of a public authority, or exceptional circumstances relating to them. The Act defines historical legislative unfairness as including legislation that did not treat males and females equally, or children of unmarried couples the same as children of married couples. Good character may be taken into account.

Whether one of these applies to a particular family history is a question of nationality law on specific facts. Only a solicitor or a person regulated by the Immigration Advice Authority may advise on it; our guide to doing it yourself or using a solicitor explains the difference.

The UK Ancestry Visa

The UK Ancestry visa is what a UK-born grandparent actually gives you, and it is a visa rather than a nationality claim. It does not make you British and it does not shorten any nationality timetable; it lets you live and work here on the ordinary path to settlement.

What GOV.UK requires

• You are a Commonwealth citizen, a British overseas citizen, a British overseas territories citizen, a British national (overseas), or a citizen of Zimbabwe
• You are 17 or over
• You can and plan to work in the UK
• You have enough money, without help from public funds, to support and house yourself and any dependants
• You have a grandparent born in the UK, the Channel Islands or the Isle of Man; or before 31 March 1922 in what is now Ireland; or on a ship or aircraft registered in the UK or belonging to the UK government

GOV.UK says you may claim ancestry through an adoptive parent or grandparent, and where your parents or grandparents were not married, but not through a step-parent.

The shape of the route

1. Apply from outside the UK. The visa costs £726 and lets you stay for 5 years. There is no sponsor and no salary threshold.
2. After 5 years, either extend for a further 5 years or apply for settlement (indefinite leave to remain).
3. Naturalisation follows the ordinary rules: 5 years' residence and 12 months free of immigration time restrictions, or 3 years' residence with no 12-month wait for the spouse or civil partner of a British citizen.

So the shortest path from arriving on an Ancestry visa to applying to naturalise is 5 years plus a further 12 months. Our guide to applying for citizenship covers what happens then, and our fees guide has the current figures for each stage.

If the Ancestry Visa Is Not Open to You

The Ancestry visa is limited to the nationalities listed above. If you are not among them, a grandparent makes no difference to which route you use, and the ordinary routes apply:

• Skilled Worker, with a job offer from an employer holding a sponsor licence
• Student, which does not itself lead to settlement but can be switched from
• Partner of a British or settled person
• Global Talent, for people endorsed by an approved body in their field

Questions and answers