General relatives:
* Family
* Relatives
* Folk
* Blood (informal, emphasizes biological connection)
* Next of kin (legal term for closest relatives)
Close relatives:
* Immediate family
* Close relations
* Blood relations
* Nearest and dearest
More specific relationships:
* Ancestors
* Descendants
* Siblings
* Cousins
* Aunts and uncles
Figurative meanings:
* Tribe (refers to a group with shared interests or characteristics)
* Clan (refers to a group with a shared ancestry or common purpose)
The best word to use will depend on the specific context and the level of formality required.