The term 'RELATED THROUGH THE MOTHER' can be summarized by two crossword solutions: ENATE and MATRILATERAL. ENATE is a five-letter word meaning 'related through the mother's side of the family'. MATRILATERAL is a twelve-letter word meaning 'relating to or based on the mother's side of the family'. Both terms refer to relationships between family members that are traced through the mother's side of the family.