Lucy Cartwright's father

Joan Redfern suggested that Lucy Cartwright's father and mother realised that Daughter of Mine was not their child and were swiftly killed. (TV: The Family of Blood)

Behind the scenes

 * Doctor Who: The Encyclopedia confirmed Joan Redfern's beliefs about the Cartwrights' deaths as true; after Lucy was possessed by Daughter of Mine, she went home and killed Mr. and Mrs. Cartwright.