Tess and Toby Cooper have adopted three children. Stroppy elder girl Frankie sneaks out at night and sets her parents arguing about her punishment as she sees Toby as a soft touch. Younger daughter Alisha has found God, thanks to a zealously religious biological grandma and, dressed as a nun, wins a theological argument with Toby. Meanwhile Tess, annoyed that little son Charlie never gets invited to other children's parties, gate-crashes a school friends birthday celebration where she exerts a little blackmail to get him accepted. Unfortunately, thanks to the face painting session she brings home the wrong child and needs the family's help to rectify the situation.