Synonyms for Maternal (same or very similar meaning)
WordNet sense 1 (related on the mother's side):
enate, enatic
WordNet sense 2 (connected by kinship, common origin, or marriage):
related
WordNet sense 3 (befitting a mother; warm and nurturing):
motherly
WordNet sense 4 (suggestive of or acting like a mother):
motherlike
WordNet sense 5 (relating to or characteristic of or befitting a parent):
parental, paternal
From the ODE community, based on WordNet
add/edit