Two Mothers, Many Problems

On Monday night, ABC Family bids farewell to the trials and tribulations of adolescent pregnancy with the finale of “The Secret Life of the American Teenager,” at 8, and introduces a different kind of motherhood in its latest original drama, “The Fosters,” at 9. Created by Bradley Bredeweg (“Fly Girls”) and Peter Paige (“Queer as Folk”), with the pop star Jennifer Lopez leading the executive producers, “The Fosters” charts the twists and turns in the lives of Stef Foster (Teri Polo), a police officer, and her romantic partner, Lena Adams...