Etymology
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familial (adj.)

1888, "pertaining to the family," from French familial, from Latin familia (see family). Meaning "hereditary" is from 1895; from 1903 as "family-like." Earlier familiar also had been used in the sense "of or pertaining to one's family" (late 14c.).

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Definitions of familial

familial (adj.)
relating to or having the characteristics of a family;
children of the same familial background
familial aggregation
familial (adj.)
occurring among members of a family usually by heredity;
familial traits
Synonyms: genetic / hereditary / inherited / transmitted / transmissible
From wordnet.princeton.edu