The phrase "be of the family" suggests a close familial connection or belongingness. Synonyms for this phrase include "be related to", "belong to the same kin", "be part of the lineage", and "share a bloodline with". These phrases highlight the importance of family ties, whether it's through blood or long-standing connections. Other synonyms that can be used to convey this same meaning include "be part of the clan", "come from the same tribe", "share a genealogy", and "count as kin". Using these phrases can add depth and warmth to descriptions of familial relationships and connections.