No. He got in contact with ET and had strange alien babies with him.
Cait Sith isn't that bad of a character, he can be cute at times. Sometimes I feel like the fandom is way too hard on the fellow. His limit breaks are basically Setzer's I mean c'mon, isn't that sort of cool ?
Plus later on he saves everybody in Junon and who doesn't like a cat and who doesn't like a Moogle ? He does have some good qualities about him. I think the fandom treats Cait Sith like he murdered Cloud's Mother. Way too tough on him.