The Chimpsons is a tv show about a family of chimpanzees. It includes a father ,mother ,one male juvenile ,one female juvenile and a female baby. It was apparently similar enough to the Simpson family that Homer Simpson proceeded to enter a lawsuit with the group who made the series.
Homer is watching television and comes across The Chimpsons and decides to not watch it, saying he had "sued it".
Behind the laughter
The show is a parody of The Simpsons show. This was even referenced in-universe when Homer, when dismissing the show, said "Sued it."