Who is the missing Walker sibling? For a year, the answer was Rebecca, but DNA has proven that that's not William Walker's unaccounted for child. It's a character named Ryan Lafferty and today a newcomer named Luke Grimes has been cast in the role.

When the storyline revealed that there was a Ryan somewhere out there, rumors were rife that a big name would land the role. Jason Ritter and Jason Dohring were in the running, but Grimes is set to sign on the dotted line and his resume is pretty slim, just a couple of minor movies, Assassination of a High School President and All the Boys Love Mandy Lane.

The Lowe brothers have taken on presidential politics . . . at least on primetime TV. Which one has the juicier role?

Rob Lowe gets to bed Calista Flockhart's Kitty Walker on Brothers & Sisters, as he portrays a smooth-talking, charismatic Republican senator seeking the presidency.

Meanwhile, Chad Lowe tries to assassinate a president and frame a terrorist for the deed on 24, as he portrays the deputy chief of staff who's trying to save the country from the commander in chief's perceived weak response to a string of terror attacks.

Rob's turn as an earnest Democratic speechwriter on The West Wing notwithstanding, who gets bragging rights in the Lowe family for the best political character?