Getting a German Passport via a German Grandfather

Eligibility hinges on jus sanguinis (descent) rules. Key steps:

1. Confirm Lineage – Grandfather was German citizen; citizenship passed to your parent (check 1914/1975/2000 law changes).
2. Gather Documents – Grandfather’s birth/marriage/death certs; parent’s birth cert; your birth cert; family tree; B1 German certificate.
3. Determine Authority – Grandfather born <1904 → Bundesverwaltungsamt (Cologne); ≥1904 → German consulate/embassy where you live.
4. Apply – Submit dossier; attend interview if required.
5. Oath – Swear allegiance upon approval.

Rules are complex (legitimacy, marriage dates, renunciations). Hire a citizenship lawyer or consult the consulate early.