Clan

A clan is a group of people united by actual or perceived kinship and descent. Even if lineage details remain unknown or non-specific, clan members may claim descent from a founding individual or apical ancestor who serves as a symbol of the clan's unity. Many societies' exogamy rules are on a clan basis, where all members of one's own clan, or the clans of both parents or even grandparents, are excluded from marriage as incest.