‘Polyfamily’ follows two married couples, Alysia and Tyler and Sean and Taya, who have chosen to live together as a closed quad. In this unconventional set-up, Tyler dates Sean’s wife, Taya, while Sean dates Tyler’s wife, Alysia. With four children already and another on the way, the quad redefines what it means to be a family. ‘Polyfamily’ premieres on Tuesday, April 29 at 10 p.m. ET/PT on TLC.