In the movie, "The Evening Star", who has custody of Melanie.?

The sequel to Terms of Endearment. Melanie Horton, played by Juliette Lewis. Her mom was Emma Horton, played by Debra Winger in part one, "Terms of Endearment". So who got custody? Melanie's grandmother, Mrs. Greenway, or was it Emma's best friend, Patsy?