I wasn’t looking forward to the prospect of a bar mitzvah comedy in which glitzy Brentwood parents (Jeremy Piven and Jami Gertz) try to outdo their neighbors, with voice-over narration provided by the dubious son. But the real focus of Mark Zakarin’s script is the dad’s resentment of his own father (Garry Marshall), a new age hippie who abandoned the family years earlier and now shows up with a girlfriend many decades his junior (Daryl Hannah). Maybe because director Scott Marshall is Garry’s son, he allows his affable father to steal the movie from everyone else, and his performance proves to be a small gift worth having. PG-13, 99 min. (JR)