Nouns

(n)blood relation, blood relative, cognate, sibone related by blood or origin; especially on sharing an ancestor with another
(n)cognate, cognate worda word is cognate with another if both derive from the same word in an ancestral language

Adjectives

(s)connate, cognaterelated in nature“connate qualities”
(s)cognatehaving the same ancestral language“cognate languages”