Four of these six countries can pass citizenship to you through a grandparent. Two usually cannot, and one of those two — the United Kingdom — is the single most common place a reader of this site is told yes by someone who is paid to say it.
Citizenship by descent is not one rule with six spellings. Each country decides separately how far down a line it reaches, and each stops on a different date: a naturalisation, a registration, a birth on the wrong side of a cut-off. The table below is that comparison, which no government publishes, because no government has any reason to describe another country’s law. Find your grandparent’s country, then read the paragraph under it.
The grandparent rule in six countries, side by side
| Grandparent born in | Does the grandparent alone reach you? | The date the line turns on | What the grant is called |
|---|---|---|---|
| Ireland | Yes — by registration, not automatically | Whether your parent was entered on the Foreign Births Register before you were born | Entry on the Foreign Births Register |
| Canada | Usually not — one generation born abroad, then a residence test | Your birth date against 15 December 2025, and your Canadian parent’s days in Canada | Certificate of citizenship (proof) |
| Germany | Yes, in principle — no generation limit, but a loss rule at every link | Every ancestor’s naturalisation date, and for births after 1999, a one-year registration | Staatsangehörigkeitsausweis (certificate of citizenship) |
| Italy | Only if the grandparent is the nearest Italian-born ancestor | Whether your application was filed before the March 2025 cut-off | Riconoscimento — recognition at a consulate, comune or court |
| Poland | Yes, in principle — no generation limit, but the old loss rules break most lines | Whether your ancestor was ever a Polish citizen, and what they did after 1920 | Potwierdzenie — confirmation by a voivode |
| United Kingdom | Usually not — one generation, with two narrow registration routes | Whether your parent was British “otherwise than by descent” | Registration under the British Nationality Act 1981 |
Read that table as four questions about people, not about countries: where your grandparent was born, where your parent was born, what your parent did before you were born, and when you were born. Every rule below turns on one of those four.
If your grandparent was born in Ireland
The line holds, and it holds through registration rather than automatically.
Under the Irish Nationality and Citizenship Act 1956, as amended, a person born abroad to a parent who was born on the island of Ireland is an Irish citizen from birth — no form, no application. A person born abroad whose grandparent was born on the island of Ireland is not a citizen yet, but is entitled to become one by being entered on the Foreign Births Register, which the Department of Foreign Affairs maintains and publishes its own instructions for on its Foreign Births Register page.
Here is the sentence that decides the next generation, and it is the reason this site exists: Irish citizenship acquired by registration dates from the date of registration, not from your birth. So if you register yourself, and your child was already born before that entry was made, your child does not inherit the line. Registered before the child is born, not after. That one ordering rule breaks more Irish lines than every other Irish rule combined, and it breaks them silently — nobody discovers it until the second generation applies.
The Department publishes the current fee and the current processing time on the page linked above. Both move, and this post does not repeat either, because a stale figure here would be worse than none. What does not move is the order: the registration rule in full is the post that takes it apart, and the Irish line is the verdict on the whole route.
If your grandparent was born in Canada
Usually the line stops at your parent, and since December 2025 there is a test that can carry it one step further.
Canada’s Citizenship Act limited citizenship by descent to the first generation born outside Canada from 17 April 2009. In December 2023 the Ontario Superior Court of Justice ruled that limit unconstitutional for many people, Immigration, Refugees and Citizenship Canada opened an interim measure in March 2025, and on 15 December 2025 the Government of Canada passed Bill C-3, which changed the limit. For a person born outside Canada on or after that date to a Canadian parent who was also born outside Canada, the line now holds if that parent spent at least 1,095 days in Canada before the birth. Checked on 5 September 2026 against IRCC’s own eligibility page, which was last modified on 18 February 2026.
So a Canadian-born grandparent reaches you only if your parent — the one born abroad — can show those days. Most cannot: a parent who never lived in Canada has none of them. That is a “stop here” more often than it is a yes, and the Canadian line says so at greater length.
If your grandparent was born in Germany
The line holds in principle, and it is broken at a link rather than at a generation.
German citizenship law has no generation limit. Under section 4(1) of the Staatsangehörigkeitsgesetz (StAG, the Nationality Act) a child acquires German citizenship at birth if a parent is German — however many generations that has run. What German law has instead is a loss rule at every link, and any one of them ends the line for everyone below it:
- Naturalisation elsewhere. For most of the twentieth century a German who voluntarily acquired another citizenship lost German citizenship by that act. The modernisation of the Nationality Act, in force from 27 June 2024, ended that for new cases — but it does not retroactively restore a great-grandfather who became an American in 1931.
- The maternal line before 1975, and the unmarried father before 1993. German citizenship did not pass from mother to child in the same way before 1 January 1975.
- Births abroad after 1999. Under section 4(4) StAG, a child born abroad after 31 December 1999 to a German parent who was also born abroad does not acquire German citizenship unless the birth is registered with a German mission within one year.
The Federal Office of Administration (Bundesverwaltungsamt) decides the certificate of citizenship and publishes the procedure in English; the German missions in the United States publish the consular half at germany.info. Two repair routes exist for lines broken by the old rules — the declaration under section 5 StAG, opened in August 2021 for ten years, and restoration under Article 116(2) of the Basic Law and section 15 StAG for the descendants of those deprived of citizenship on political, racial or religious grounds. Both are dealt with in the German line; the declaration itself is a post of its own, because its window closes.
If your grandparent was born in Italy
Since March 2025 this is the one country in the table where a grandparent is the outer edge rather than a comfortable middle.
Italian citizenship passes by descent under Law no. 91 of 5 February 1992, and for decades it ran without a generation limit: an Italian ancestor who had not naturalised before the next birth passed the line down indefinitely. A decree-law of 28 March 2025, converted with amendments into law in May 2025, cut that. For a person born abroad who holds another citizenship, recognition now generally requires an Italian-born parent or grandparent — two generations — with transitional treatment for applications already filed before the cut-off. The Ministry of Foreign Affairs publishes the operating rule and the consular procedure on its citizenship pages, and Law 91/1992 itself is on Normattiva.
Two consequences follow, and they point in opposite directions. If your Italian-born ancestor is your grandparent, you are inside the new limit and the question becomes the old one: did anybody in the chain naturalise before the next birth? If your Italian-born ancestor is your great-grandparent, the answer is stop here unless you filed before the cut-off — which is what the great-grandparent post is about. And a line that runs through a woman before 1 January 1948 is a court case, not a consular filing.
If your grandparent was born in Poland
The line holds in principle and breaks in practice, and it breaks on rules written before your grandparent left.
Poland has no generation limit: if an ancestor was a Polish citizen and each person in the chain passed it down, the line reaches you, and you establish it by asking a voivode (wojewoda) for confirmation of possession of Polish citizenship — potwierdzenie posiadania obywatelstwa polskiego, the procedure gov.pl describes on its own service page. The confirmation is a finding about a status you already have, not a grant.
The breaks are the whole difficulty. Polish citizenship as a modern status begins with the Act of 20 January 1920, so an ancestor who emigrated before the Polish state was re-established may never have held it at all — and under that Act and the Act of 1951 that followed, acquiring a foreign citizenship, and in some cases foreign military service or public office, ended it. A great-grandfather naturalised in 1928 breaks the line for everyone born after him. The Polish line sets out the loss rules; it is the country in this table where a professional archive search most often changes the answer.
If your grandparent was born in the United Kingdom
Stop here, in most cases, and the reason is a legal term rather than a policy.
Under the British Nationality Act 1981, a person born outside the UK to a British citizen parent is British “by descent” — and a British citizen by descent generally cannot pass citizenship on to a child who is also born outside the UK. So the line usually holds for exactly one generation born abroad. Your parent, born abroad to your UK-born grandparent, is very likely British by descent. You, born abroad to that parent, are very likely not British at all. The Home Office’s own starting point is gov.uk’s page for a claim through a British parent.
Two narrow registration routes exist, and each has conditions and, in some cases, a deadline: they are what the double-descent post covers. What remains for most readers is a visa route rather than a citizenship claim, and this site does not write about visas. The British line gives the full verdict, including the answer to the Scottish version of the question: there is no separate Scottish citizenship, the line is British, and it holds for one generation.
Where the answer is stop here
Four rows in the table above end most claims, and each ends it at a different place:
- A UK-born grandparent, and no other route. One generation, and your parent used it.
- An Italian-born great-grandparent, filed after March 2025. Outside the new limit.
- A Canadian-born grandparent whose child never lived in Canada. No days, no line.
- A German or Polish ancestor who naturalised before the next birth in the chain. The line ended in their lifetime, not in yours.
None of those is a paperwork problem, and none is solved by paying someone to file. That is worth saying plainly, because the pages that rank on these questions are almost all written by firms and consultancies that are paid per application and are structurally unable to publish the sentence “your line does not qualify”. Which claims need a lawyer separates the cases where a professional genuinely changes the outcome from the ones where a register takes a form.
What to check before you pay anyone
In this order, because each answer decides whether the next question matters:
Where your grandparent was born, exactly#
The country as it is today, and the country as it was on the day of the birth. A grandparent born in 1919 in what is now Poland, or in 1920 in what became the Irish Free State, is a different question from one born there in 1960 — the cut-offs post is entirely about this.
Where your parent was born#
Whether your parent was born in the grandparent’s country or abroad decides which rule reads your case in all six countries.
Whether anyone in the chain naturalised, and on what date#
This is the single record that decides most breaks, in Germany, Italy, Canada and Poland alike. It is also the hardest one to find: finding the naturalisation date names where it lives.
Whether a registration was made in time#
Ireland’s Foreign Births Register entry before the child’s birth; Germany’s one-year registration for a birth abroad after 1999. Both are ordering rules, and neither can be repaired afterwards.
Answer those four and you will know which of the six paragraphs above is yours. Then read that country’s verdict in full — the posts below take each rule apart one at a time, name the exceptions, and say where a claim stops.
- You May Already Be a Citizen: the Countries Where the Line Passes at Birth Without a Form — How do you know if you have dual citizenship already? In Canada, Germany, Italy and Poland a qualifying line makes you one at birth. Ireland is different.
- Which Claims Need a Lawyer, and Which the Register Takes on a Form — Most claims are a form the register takes from you. Four situations need a citizenship by descent lawyer: a court, a discretion, a restoration, a disputed loss.
- Registration, Proof, Certificate, Confirmation: What Each Country Calls the Grant, and Who Issues It — Registration, proof, certificate, recognition, confirmation: what a certificate of citizenship by descent is called in each country, and who issues it.
- Two Lines, Three Passports: Whether Each Country Lets You Hold a Third — There is no worldwide limit on how many citizenships you can have, only each country's rule about its own. Ireland, Canada, Germany, Italy, Poland and the US.
- Which Descent Countries Allow Dual Citizenship With the United States, Dated — What countries allow dual citizenship with the US? All six a descent claim runs through, each rule dated, and the German one that changed on 27 June 2024.