Maggie Cooper was the daughter of Paul and Celeste Cooper, brother of Finn Cooper, and half-sister of Lilly and Christina Rush. Virtually nothing is known about Maggie. She was first mentioned in Lilly's dream in "Into the Blue", however Paul's wife and son, Celeste and Finn, were mentioned as well, suggesting Maggie is her real name. Maggie's name was mentioned before Finn's, suggesting she was older. She was not present, or mentioned, at the family dinner in "The Good Soldier". Given Finn was mentioned as approaching college-age, Maggie may have been away at school.