In ET’s exclusive preview clip of Sunday’s ‘Sister Wives,’ the Browns open up about feeling isolated from other plural families while they live in Arizona. Kody, Meri, Janelle, Christine and Robyn take a trip to visit their pals, the Dargers, who also lead a plural lifestyle. The Browns admit that they often feel isolated while living in Arizona, away from other plural families. ‘Sister Wives’ airs Sundays at 10 p.m ET/PT on TLC.