Mormon's believe all kinds of wacky shit....most people just think they are a sect of Christianity but they are as looney as they come when it comes to their beliefs. Basically, according to them, male members of the LDS are here as a means of proving their worthiness to their ancestral and celestial divinity. If they do well here, they get promoted to godhood after they die. The reason for multiple wives, espoused by the ORIGINAL mormons, is that the male gets to "invite" his earthly wives into the Celestial kingdom if he attains that. Otherwise, the wives don't get to go to "heaven" after they die....it's by invitation from their husband after death.
They look all normal and wholesome on the outside, but the center of this cult is as greasy as it gets.
_________________________
Darrah Ford's family video archives - Father's Day, 1996: