Sunday June 15 9:30pm (M) on Seven

On tonight’s season finale of BROTHERS AND SISTERS, Sarah discovers another devastating secret that William Walker has kept from the family.

Kevin and Scotty make a commitment to be life partners; Saul finally deals with his identity in a public way, and the family discovers that William kept yet another painful secret from his family.

BROTHERS AND SISTERS stars DAVE ANNABLE as Justin Walker, Maxwell Perry Cotton as Cooper Whedon, Kerris Lilla Dorsey as Paige, SALLY FIELD as Nora Holden, CALISTA FLOCKHART as Kitty Walker, BALTHAZAR GETTY as Thomas Walker, RACHEL GRIFFITHS as Sarah Whedon, ROB LOWE as Senator Robert McCallister, SARAH JANE MORRIS as Julia Walker, MATTHEW RHYS as Kevin Walker, RON RIFKIN as Saul Holden, EMILY VANCAMP as Rebecca Harper and PATRICIA WETTIG as Holly Harper, with LUKE MACFARLANE as Scotty Wandell and TOM SKERRITT as William.