European is not a nationality.
The family connection must be tied to a particular country's law and history. Citizenship of an EU member state can create wider mobility rights, but the qualifying research remains national and evidence-specific.
Start with the ancestor, not the destination.
You may dream about living in Portugal while the relevant nationality question is Irish, German, Polish, or another EU state. We therefore separate the country that could establish citizenship from the country where you may eventually choose to live.
Different countries, different evidence.
Birth records, naturalization dates, registrations, marriages, wartime history, and residence can matter differently from one jurisdiction to another. The common method is a sourced family timeline.
Official sources
Citizenship remains a matter of each country’s nationality law. Where a person is already a citizen of an EU member state, EU institutions provide the authoritative overview of cross-border residence and work rights.
Next step
The free screen is designed to tell you whether the connection is worth a closer look. The $500 Nationality Research Assessment is the point where a human researcher reconstructs the relevant line and provides a written, source-backed conclusion.