1. 家庭（或家族）的;家庭(或家族)特有的
Familial means relating to families in general, or typical of a family.

1. occurring among members of a family usually by heredity

e.g. an inherited disease
familial traits
genetically transmitted features

Synonym: genetichereditaryinheritedtransmittedtransmissible

2. relating to or having the characteristics of a family

e.g. children of the same familial background
familial aggregation