Does the line hold? Citizenship by descent, one verdict at a time.
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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.
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.