A big wedding is coming up and the groom, your adopted son, never told his (Catholic) birth mother that you divorced years ago. What are you gonna do? Trust me, it's R-rated! Adapted from John Stéphane-Bron's original screenplay "Mon frère se marie" we watch a comedy of errors as these good folks try to sort things out.

If you look at the cast, you know this movie is targeted for "People of a certain age..."

• * Robert De Niro ("Silver Linings Playbook") is Don, the groom's father, who has to let his mistress of eight years move to a hotel while he pretends to still be married to the mother of his children.
• * Dianne Keaton ("Darling Companion") is Ellie, who, eight years ago, lost her husband of twenty years to her best friend. Even though the divorce was amicable, things ARE a bit awkward.
• * Susan Sarandon ("Snitch") plays Bebe, the "other" woman, AND Ellie's former best friend.
• * Katherine Heigl (''Life as We Know It") is their eldest daughter Lyla, who is in the throes of a divorce but hasn't told her parents yet.
• * Topher Grace ("The Double") is Jared, always loyal to his brother and sister but also working on his own growth as a man. (LOVED seeing Topher again!)
• * Amanda Seyfried ("Les Miserables") plays Missy, the bride, with her own drama as her parents unveil some of THEIR secrets.
• * Ben Barnes ("Chronicles of Narnia") impressed me as Alejandro, their son who was adopted from Columbia. He's the groom and his birth mother is the one they are deceiving. This British-born actor not only spoke American, but he seemed to speak Spanish pretty well, too.

This is light, silly, contrived and a bit vulgar. Everyone is a good sport and there are no real bad guys, so if you are looking for a bargain matinee somewhere....