Here is the scene from episode 303 of Brothers And Sisters entitled 'Tug of War'. It's the scene where Sarah stands up for Tommy at the boad meeting, then announces that she's quitting.
Here is the promo for the special 2hr movie event episode of ABC's 'Bothers And Sisters' episode 316 & 317. This episode airs from 9/8c on Sunday 1st March 2009 on ABC.