Synonyms for Agnate (same or very similar meaning)
WordNet sense 1 (one related on the father's side):
patrikin, patrisib, patrilineal kin, patrilineal sibWordNet sense 2 (related on the father's side):
paternal, agnaticWordNet sense 3 (connected by kinship, common origin, or marriage):
relatedFrom the ODE community, based on WordNetadd/edit