What documents prove a family relationship for Croatian family reunification?

Croatia expects you to evidence the relationship with formal documents. For a spouse, that means an extract from the marriage register; for children, a birth register extract or an adoption decision establishing the parent-child link.

For a common-law partnership, you typically show cohabitation of at least three years, supported by records or witness statements. One useful exception: family members of Croatian nationals generally do not have to submit these vital records themselves, because the authorities obtain them ex officio.