Sister Wives star Robyn Brown has had shifting views surrounding plural marriage and monogamy throughout the years, which has been confusing at times for viewers of the show. Robyn, who married Kody Brown in 2014 after four years of courting, has spent the majority of her life in the Apostolic United Brethren (AUB) church, a fundamentalist group that branched off from the Church Of Latter-Day Saints. The Mormon church has several different branches and the AUB group is a sect of traditional Mormonism that takes a bit of a firmer stance on some of the more traditional areas of practice.

https://screenrant.com/sister-wives-robyn-brown-changing-views-living-monogamy-explainer/