After a troubling week at the Walker household, a little levity was in order. That turns out to be in the form of an impromptu mother-daughters getaway. The excuse? To get Sarah's mind off her impending divorce. Accompanied by Kitty and Nora, the three women head off for a spa retreat, where they crash a wedding and get into the usual Walker trouble. Watch a sneak peek of Sunday's episode (ABC, 10 p.m. ET) here.