Whose sister did Melissa Sue Anderson play in "Little House on the Prairie?"
Melissa Sue Anderson Melissa Sue Anderson (born September 26, 1962) is an American-Canadian actress. She began her career as a child actress. Anderson is known for her role as Mary Ingalls on the NBC drama series "Little House on the Prairie".
Susan Olsen Susan Marie Olsen (born August 14, 1961) is an American former child actress, animal welfare advocate, artist, and former radio host. Olsen is known for her role as Cindy Brady, the youngest Brady child in the sitcom "The Brady Bunch" for the full run of the show, from 1969 to 1974.