<Tr> <Th> Spouse (s) </Th> <Td> Michael Sloan (m . 1990) </Td> </Tr> <Tr> <Th> Children </Th> <Td> </Td> </Tr> <P> 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 . </P> <P> She is also known for her film roles; Vivian in Midnight Offerings, Ginny in the slasher Happy Birthday to Me, and Alex in the ABC Afterschool Special, Which Mother Is Mine? . </P>

Who played mary on the little house on the prairie