If your parent naturalised as an American before you were born, your German, Italian, Polish and — if the birth was before 1977 — Canadian lines are very likely already over. Not weakened, not harder to prove. Over, in the year your parent signed the petition, and for everyone born after that date.
Your Irish line is untouched, and the reason is worth holding on to: Ireland’s rule turns on where an ancestor was born, not on what status they held later.
This is the break that decides more claims on this site than any other, and it turns on a single comparison — the naturalisation date against the next birth in the chain. Here is how each country reads it.
Does my parent’s naturalisation before my birth break the line?
In four of the six countries, yes, and the mechanism is identical in each.
These countries did not merely decline to recognise a second citizenship. They ended the first one at the moment the second was acquired. A person who lost German citizenship in 1953 was not German in 1954, so a child born to them in 1954 had no German parent, and was never German at all. There is no application that fixes this, because there is nothing to prove: the child was not a citizen and never became one.
The order is everything:
- Naturalised before the child’s birth — the child was never a citizen. The line ends with the parent.
- Naturalised after the child’s birth — the child acquired citizenship at birth and keeps it. The parent’s later loss does not reach backwards.
One date on one certificate decides which of those two sentences is yours, and the certificate is usually findable. Everything below is about which date, in which country.
Germany: the loss ran from 1913 until 27 June 2024
German citizenship passes without a generation limit, and it was lost at every link where somebody naturalised elsewhere.
Under the Reichs- und Staatsangehörigkeitsgesetz of 22 July 1913, and then section 25 of the Staatsangehörigkeitsgesetz that grew out of it, a German who acquired a foreign citizenship on their own application lost German citizenship by that act. The Act modernising German nationality law ended that for new cases with effect from 27 June 2024. It did not restore anybody: a great-grandfather naturalised in 1931 is still not German in 1932, and neither is the child born to him that year.
There is a second trap in the older law, and it is the one that most often surprises a reader who has found the file. Under the 1913 Act the loss could extend beyond the person naturalising — to a wife, and to minor children in that parent’s custody. So a child who was already German at birth may still have lost it as a ten-year-old, along with the father. Read the naturalisation record itself rather than assuming; whether the loss extended, and to whom, is written in the file and in the law as it stood on that date, and it is not something to take from a summary. The German line sets out the loss rules in order.
Where the loss was not a naturalisation but the old treatment of a mother’s line, there is a route: the declaration under section 5 of the Staatsangehörigkeitsgesetz, which also reaches the descendants of the person affected. The declaration route is that post, and its window closes. Nothing in section 5 repairs a straightforward naturalisation.
Italy: the 1912 law, and what the 1992 law did not undo
The Italian rule is the same shape and the dates are different.
Under Law no. 555 of 13 June 1912, an Italian who voluntarily acquired a foreign citizenship lost Italian citizenship. Law no. 91 of 5 February 1992 replaced that regime and states the descent rule in its first article — “È cittadino per nascita: a) il figlio di padre o di madre cittadini,” a child of a citizen father or mother is a citizen by birth. Checked against Normattiva on 15 September 2026.
The 1992 Act changed the rule going forward. It did not make a great-grandfather who naturalised in 1928 retrospectively Italian in 1929, and Italian consulates read the chain under the law in force on each date in it. So an Italian claim is worked backwards generation by generation, and the first naturalisation that precedes a birth ends it.
Since a decree-law of 28 March 2025, converted with amendments in May 2025, there is a second and independent limit on top of this: recognition for a person born abroad holding another citizenship generally now requires an Italian-born parent or grandparent. A line can therefore fail twice — once on the naturalisation, once on the generation count. The Italian line after the 2025 decree takes both apart.
Canada: this break only exists before 1977
Canada is the country where the answer most often turns out to be better than the reader feared, and the reason is a date.
Before the Citizenship Act that came into force on 15 February 1977, a Canadian who acquired another nationality could lose Canadian citizenship, and children could lose it along with a parent. After that date, taking another citizenship does not cost a Canadian their own. Amendments in 2009 and again in 2015 restored citizenship to many of the people the older rules had cut out — the group generally called Lost Canadians — and that restoration is the thing a stale page most often misses.
So the question for a Canadian line is not only “did they naturalise” but “when”, and a naturalisation in 1981 is simply not a break at all. What may still end a Canadian line is the generation limit rather than a loss: descent was capped at the first generation born outside Canada from 17 April 2009, and Bill C-3 replaced that cap on 15 December 2025 with a test requiring that “your Canadian parent spent at least 1,095 days in Canada before you were born.” Checked on 15 September 2026 against Immigration, Refugees and Citizenship Canada, last modified 18 February 2026. The Canadian line is the full verdict, and the proof application is how it is established.
Poland: the 1920 Act, and the archive search that settles it
Poland has no generation limit either, and it has the widest set of loss rules in this table.
Under the Act of 20 January 1920 on Polish citizenship, and the Act of 8 January 1951 that replaced it, Polish citizenship was lost by acquiring a foreign citizenship — and, under the 1920 Act, also by service in a foreign army or the acceptance of public office abroad without permission. That last one is why a Polish claim so often fails at a step nobody in the family remembers: a great-grandfather’s conscription into another country’s forces in the 1930s is a loss event, and it is recorded somewhere neither he nor his children thought of as a citizenship document.
The confirmation of Polish citizenship is a finding about a status you already have, made by a voivode, and the office will read the chain under the Act in force at each link. This is the country where a professional archive search most often changes the answer, and it is also the country where it most often changes it to no. The Polish line sets out the loss rules in order.
Why Ireland does not have this break
The Irish rule is built on a different fact, and this is the single most useful sentence on this page for most readers of this site.
Entitlement through a grandparent under the Irish Nationality and Citizenship Act 1956 turns on the grandparent having been born on the island of Ireland. A birthplace is not a status and cannot be lost. Your grandmother who was born in Mayo in 1921, emigrated in 1948 and became an American in 1955 is still, in 1956 and in 2026, a person born on the island of Ireland. The Department of Foreign Affairs publishes the route on its Foreign Births Register pages.
So no Irish naturalisation search is needed at all, for the claim itself. What Ireland has instead is an ordering rule, and it is severe: citizenship acquired by entry on the Foreign Births Register dates from the date of registration, so a parent must be registered before a child is born for that child to inherit anything. The Foreign Births Register is that rule in full, and the Irish line is the verdict on the whole route.
Read the two rules beside each other and the shape of this site’s advice becomes obvious: a reader with both an Irish and a German grandparent should check the Irish side first, because it cannot have been broken by anything that happened after the birth.
Finding the date, and what to do when there is not one
You need one document: the naturalisation record of the person in the chain who moved. It carries the date of the oath or the certificate, and that is the date the countries above read.
Three things are worth knowing before you order anything:
- The date that matters is the naturalisation, not the arrival. A grandfather who arrived in 1923 and naturalised in 1939 did not break a line for a child born in 1930.
- “He never took out papers” is a family claim, not a record, and it is wrong often enough to be worth testing.
- No record found is not the same as no naturalisation. Where the file cannot be found, say so to the register or the consulate and let them tell you what they accept.
Finding the naturalisation date names the three places the record lives and what each costs.
If the date falls on the wrong side
Then stop here, for that country.
That is worth stating plainly because almost nobody else will. An application made on a line that ended in 1928 can still be prepared, submitted and invoiced. It cannot succeed, and no amount of supporting documentation changes a date on a certificate.
Two honest things remain when the date is wrong. Check the other grandparent — most readers of this site have more than one foreign-born ancestor and only ever investigated the famous one. And check whether the break is one of the repairable kinds rather than this one: a mother’s line before a cut-off, a wedding, a birth outside marriage. The seven breaks sorts them, and which claims need a lawyer says where a professional genuinely changes an outcome. A naturalisation before the next birth is not one of them.