Synopsis by Hal Erickson
Fans of the The Mary Tyler Moore Show spin-off Rhoda will recall that heroine Rhoda Morganstern (Valerie Harper) has a neurotic younger sister named Brenda. However, in this Mary Tyler Moore episode, Brenda is nowhere to be found; instead, Rhoda has suddenly acquired a kid sister named Debbie (Liberty Williams), who has never been seen before and will never be seen again. No matter, as Debbie serves an important plot purpose when Rhoda and Mary (Mary Tyler Moore) head to New York to attend Debbie's wedding -- an occasion made both memorable and unbearable by Rhoda's mother, Ida (Nancy Walker), who has convinced herself that the air is thick with sibling jealousy. "Rhoda's Sister Gets Married" was originally broadcast on September 29, 1973.