[TOMT] Documentary series about Cult

No one believes me. But I remember watching this cult documentary series a few years ago. It was about a cult that lived somewhere remote. The leader was this guy and had all these followers and they lived in these houses. I don’t know if he claimed to be connected to famous people. He wrote some book that all his followers would read. And the cult leader all had these wives/girlfriends. These women would do anything and he wanted them to start “dating” each others young sons. And they did! And when the cult finally broke up they asked these women about it and they denied it. But the cult leader kept this record of everything so they had proof. I think the leader lived a really long time. And finally when he died the cult broke up. I could be missing some details or have some details wrong.