Marlo Thomas guest stars as Rachel's (Jennifer Aniston) mother, Sandra Green, who shows up at the apartment with startling news. This comes just as Ross' (David Schwimmer) ex-wife, Carol (Jane Sibbett), is about to marry her girlfriend, Susan (Jessica Hecht), in an event catered by Monica (Courteney Cox). And Phoebe's (Lisa Kudrow) elderly massage client Mrs. Adelman dies -- but her spirit isn't about to leave until she sees how the of rest of the episode comes out. Candice Gingrich, sister of Senator Newt Gingrich, has a significant supporting role. ~ Hal Erickson, Rovi