Ben learns why Riley doesn't like celebrating her birthday and it's all his fault. He knows he needs to make it up to her and plans a perfect birthday surprise, but in typical Ben Wheeler fashion, disaster ensues. Bonnie realizes she may have made a mistake in filing Emma's parental rights paperwork and Ben doesn't officially have sole custody. Bonnie enlists Tucker's help in tracking down Emma's mother, Angela (played by Mimi Gianopulos), to re-sign the papers, but bringing this baby mama back into their lives may spell trouble. Meanwhile, Amy (played by Lacey Chabert) calls Danny on his lingering feelings for Riley.