Size of the family

A Catholic, a Baptist and a Mormon were sitting together one Sunday bragging about the size of their respective families.
The Catholic said, "I've got a pretty big family. In fact I've now got four kids, all boys. One more and I could have a basketball team."
The Baptist said, "That's nothing. I've got eight boys, one more and I could have a baseball team!"
The two looked at the Mormon. After a moment of contemplation, he said, "Well guys, I now have 17 wives. One more and I could have a golf course."