Brothers & Sisters has pulled off some game-changing plot twists involving the Walker family's biological lineage before, and may not be done yet, according to an E! report.

Rebecca, of course, was cast as William's love child with Holly. Until David was revealed to be her real father, and Justin married her. Then we had the whole Ryan fiasco.

Now, the rumor is that "Sarah starts to question her paternity and Nora gets defensive about when her actual wedding date was." Any theories on what that could mean?

Also on tap: Saul and Jonathon will fight over Saul's jealousy, and Ryan Devlin (Seth) says "something deeper" will develop between his character and Kitty's. Hot stuff!

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.