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".
Erica McDermott Erica McDermott (born April 26, 1973) is an American actress, best known for her role as Cindy "Tar" Eklund, the lead's character's sister, in David O. Russell's film "The Fighter" (2010).