After Leonard's father, Alfred and Sheldon's mother, Mary share an evening together, everyone deals with an awkward morning the following day. Also, Penny's family arrives for the ceremony, including her anxiety-ridden mother, Susan, and her drug dea... (more)ling brother, Randall.

Christine Baranski, Dean Norris, Jack McBrayer, Judd Hirsch, Katey Sagal, Keith Carradine, Laurie Metcalf