Meaning

adjective relating to or having the characteristics of a family

adjective occurring among members of a family usually by heredity

originFrom French familial (“relating to a family; familial”), from Latin familia (“family (in the sense of the slaves working for a household); household”) (from famulus (“servant; slave”), ultimately from Proto-Indo-European *dʰh₁-m-eló-, from *dʰeh₁- (“to do, place, put”)) + French -al (adjective-forming suffix) (from Latin -ālis, from Proto-Indo-European *-li-). By surface analysis, family + -al.…

Etymology from Wiktionary, CC BY-SA 3.0