David (Bryan Greenberg) is a 23-year-old Jewish painter and Rafi (Uma Thurman) a 37-year-old WASP divorcee, so when these New Yorkers become a couple, everyone's a bit surprised. But no one's more confused than Rafi's therapist (Meryl Streep), who turns out to be David's mother and whose progressive ideas don't extend to her son. Writer-director Ben Younger (Boiler Room) handles the actors with a light hand, but the real revelation here is Streep, who spends every moment comically negotiating her conflicted impulses. PG-13, 105 min. Century 12 and CineArts 6, City North 14, Crown Village 18, Gardens 7-13, Lake, Norridge, 600 N. Michigan, 3 Penny, Village, Wilmette.