familial vs hereditary

familial and hereditary both are adjectives.

Word	Noun	Adjective	Verb	Adverb
familial	No	Yes	No	No
hereditary	No	Yes	No	No

As adjectives, familial and hereditary are synonyms defined as:

familial and hereditary: occurring among members of a family usually by heredity

Other synonyms of familial include genetic, inherited, transmissible, transmitted.

familial (adjective)	hereditary (adjective)
relating to or having the characteristics of a family	occurring among members of a family usually by heredity
occurring among members of a family usually by heredity	inherited or inheritable by established rules (usually legal rules) of descent