Synonyms and related words :
agent, ancestor, ancestorial, ancestral, ancestress, author, begetter, beginner, catalyst, causer, creator, effector, engenderer, father, fatherlike, fatherly, generator, grandfatherly, grandmotherly, grandparent, grandparental, guardian, inspirer, instigator, maker, mater, materfamilias, maternal, mother, motherlike, motherly, mover, origin, originator, parental, pater, paterfamilias, paternal, patriarchal, prime mover, primum mobile, procreator, producer, progenitor, progenitress, progenitrix, root, sire, source, stepfather, stepmother