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For people born after 23 May 1949, and their descendants, who missed German citizenship because of the old rules that treated mothers and fathers differently. The declaration must be received by 19 August 2031.

Or see how it works first: an invented family for each country, with documents part way through and a few mismatches to find. 5 samples.

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Organiser, not legal advice. Rules change: confirm with the consulate or a lawyer. New to this? Read citizenship by descent through a grandparent or check the rules by country.