When Danny (Bob Saget) begins dating Gia's mom Claire (Andrea Abbate), Steph (Jodie Sweetin) begins fantasizing about a future in which she and Gia (Marla Sokoloff) will be stepsisters. But jealous Michelle (the Olsen twins) isn't about to accept Claire as her new mom, and she goes out of her way to discredit the poor woman in Danny's eyes. Elsewhere, Viper (David Lipper) is turned off by the fact that DJ (Candace Cameron) seems smarter than he is (which frankly isn't very hard), while Joey (David Coulier) falls for a Frenchwoman named Yvette (Susan Vinciotti). ~ Hal Erickson, Rovi