γελᾷ δ' ὁ μωρός, κἄν τι μὴ γέλοιον ᾖ → the fool laughs even when there's nothing to laugh at
ὁμοπάτηρ, -ερος (Α)ομοπάτριος.[ΕΤΥΜΟΛ. < ομ(ο)- + πατήρ.
