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".
Lani O'Grady Lani O'Grady (October 2, 1954 – September 25, 2001) was an American actress and talent agent. She is best-remembered for her role as Mary Bradford, the eldest sister from "Eight Is Enough".