Care to guess who's been cast as Sally Field's mom on Brothers & Sisters? Here's a hint:

Sunday, Monday, Happy Days,
Tuesday, Wednesday, Happy Days,
Thursday, Friday, Happy Days,
Saturday, what a day,
Rockin' all week with you.

If you guessed Marion Cunningham Ross, you're right! Although unconfirmed by ABC, sources tell me that Ross has landed the one-episode gig and will show up in February. Her character is described as "tough, obstinate, judgmental, direct and uncompromising." Happy days, indeed!