2 sons and 2 dads go fishing, at the end of the day they catch 3 fish and ea. eat's only 1. the fish are not divided or cut in any way, they ea. eat a whole fish. How?
Answer: there's a grandfather, a dad, and a boy.
The grandfather is the father of the dad and the dad is the father of the boy. the dad is the son of the grandfather and the boy is the son of the dad.