Does the line hold? Citizenship by descent, one verdict at a time.
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Irish citizenship through a great-grandparent is usually no. It turns on one date: your parent's entry in the Foreign Births Register against your birth.
A citizenship by descent cut-off date can predate the state itself — 1861 Italy, 1871 Germany, 1920 Poland, 1922 Ireland, 1947 Canada. What each one decides.
Born outside marriage or adopted: where a citizenship by descent claim still holds, where it needs a declaration, and where an adoption ends the line instead.
Where a grandmother lost citizenship by marriage the line ends at the wedding, not at a birth. The rule in Germany, Italy, Britain and Poland, each dated.
Citizenship by descent through a mother breaks at 1948 in Italy, 1975 in Germany, 1983 in Britain. Two of the three have a repair route; one needs a court.
If a parent naturalised before you were born, a German, Italian, Canadian or Polish citizenship by descent claim usually ends there. Ireland is the exception.
Can you lose your citizenship before you are born? The seven breaks that end a descent claim in Ireland, Canada, Germany, Italy, Poland and the UK, dated.
Whether a grandparent born in Ireland, Canada, Germany, Italy, Poland or the UK passes citizenship by descent to you, and where the answer is stop here.