Think in chronological order
A later birth may depend on an earlier marriage already appearing in Greek records. Build a timeline for every generation before choosing a consular service.
Which family events must be registered before Greek citizenship?
General information only. Your dates, family circumstances and competent authority determine the actual procedure.
Match foreign and Greek records
Differences in names, dates or places should be identified before submission. Whether a correction or additional evidence is needed is decided by the competent authority.
Use the competent consulate
Civil events are handled according to territorial jurisdiction. Check the mission responsible for where the event occurred and follow its current document instructions.