We are back at 7:43 with modern polygamy. A new reality series about people in a group marriage, a husband and five wives who insist that can be Progressive. ABC's Cecilia Vega has their story.... See More
We are back at 7:43 with modern polygamy. A new reality series about people in a group marriage, a husband and five wives who insist that can be Progressive. ABC's Cecilia Vega has their story. Reporter: Whatever you thought you knew about polygamy. Think again. I consider myself a feminist. Reporter: You see Brady Williams, his five wives and their 24 kids used to be fundamentalist mormons but not anymore. A lot think we're crazy we're together still but we spent years and years building this family and we love each other. Reporter: They still live in rural Utah surrounded by polygamist neighbors but the similarities end there. They're pro-gay marriage and have an occasional drink and believe in buddhism. Even from the outside in I'm still scratching my head. They call themselves Progressive polygamists and in the spirit of enlightenment, on their new tlc show "My five wives" they invite cameras where none have gone before into the polygamy bedroom. I haven't stopped chasing you around the room. You horndog. Now, there's no hanky panky going on. Reporter: Here's how it works. He rotates between wives. Each wife gets to sleep with him every fifth night and when he's not there. Christmas I made each wife a body pillowcase that just had Brady -- My kids. Reporter: The next day, the next wife. This is something a Mo nothing ga mouse could never experience but how in the world I can have no socks or underwear in one house and 30 in another when I am completely fair in how I go from house to house.phenomena. The biggest polygamy problem of all, jealousy. You know he's having relations with other women. Yep. Do you think about that? I don't. It hurts me if I go there. I don't want to put myself through that. Reporter: In the Williams' house there never seems to be enough chairs and their monthly grocery bill, $4,000. It's not that complicated. We love each other. Reporter: One man and his five wives under one very big roof. For "Good morning America," Cecilia Vega, ABC news, rocky ridge, Utah. You can see more of so veal Ya's report on modern polygamy on "Nightline" tonight, josh.
This transcript has been automatically generated and may not be 100% accurate.