The Browns plan a vacation with their polygamist friends, the Dargers as they head to the beach for some polygamist fun in the sun. For the first time we'll meet another polygamist family and discover how they're the same, or different from the Browns.

Tensions rise as the Sister Wives fight for the bonus features they want for each house. Who stays in budget and who goes way over? Later, the Brown family digs deep when the family pet is ailing. A compromise leaves them all in tears.