Adjectives

(a)maternalcharacteristic of a mother“warm maternal affection for her guest” (Dorothy Sayers)
(a)maternalrelating to or derived from one's mother“maternal genes”
(a)parental, maternal, paternalrelating to or characteristic of or befitting a parent“parental guidance”
(s)enate, enatic, maternalrelated on the mother's side“my maternal grandmother”