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Your grandparents may have left you more than memories — many countries grant citizenship (and a passport) to descendants of their nationals. It's often free, and for EU countries, it unlocks the right to live and work anywhere in Europe.
Citizenship by descent (jus sanguinis) allows you to claim nationality through your parents, grandparents, or in some cases great-grandparents. Requirements vary by country — some require only proof of lineage, others need language proficiency or a visit. Italy has no generational limit. Ireland goes to grandparents. Poland and Hungary extend further with documentation. The process is typically free (aside from document fees) and results in full citizenship with a passport.
Albania
Argentina
Armenia
Australia
Austria
Belgium
Brazil
Brazil
Bulgaria
Croatia
Czechia
Denmark
Estonia
Finland
France
Germany
Germany
Greece
Hungary
Ireland
Israel
Italy
Latvia
Lithuania
Mexico
Moldova
Montenegro
Netherlands
New Zealand
Norway
Philippines
Poland
Portugal
Portugal
Romania
Serbia
Slovakia
Slovenia
South Africa
Spain
Sweden
Turkey
United Kingdom
Ukraine