Weeks away from his bar mitzvah, Ben (Daryl Sabara) is panic-stricken about his pending adulthood and the stadium-sized party that his father (Jeremy Piven) has planned. Ben's only hope is to invite his estranged, eccentric grandfather to sabotage the day. This family comedy also stars Doris Roberts, Jami Gertz, Daryl Hannah, and the director's father, Garry Marshall.