Fathers' rhymes with:
arthur's, arthurs, author's, authors, authors', coauthors, crowther's, crowthers, ethers, mothers', panther's, panthers, panthers', walthers
Fathers' sounds like:
father's, fathers, feathers, features, fedders, fedders's, federica, federici, federico, fedorchak, fedorko, fedrick, feeders, fetters, fidora's, footrace, footwork, future's, futures, futures', fyodor's