Sarah, age 16 in season 1, struggles with the choices her parents made when she was a child to follow the fundamentalist principle of polygamy.
She eventually wants to go to prom and takes Ben and her young uncle, Frankie, as their dates to her and Heather.
Margene is excited, Barb and Ben are opposed, and Bill, reluctant at first, eventually agrees to give his blessing, saying he has no other choice.
Sarah and Scott are married in the second episode, in a secular ceremony in the communal backyard of the Henricksons' homes, conducted by a Justice of the Peace.
Scott goes away for business and Sarah takes it upon herself to help a Native American girl who is a drug abuser.
In the eighth episode "Next Ticket Out" she shocks the family by telling them that she and Scott will leave Utah to move to Portland to start a new life together.