The dysfunctional Griffin family must try to be civil to one another in the latest trailer for Lionsgate's The Big Wedding, the directorial debut of The Bucket List writer Justin Zackham. Robert De Niro and Diane Keaton star as a long-divorced couple who must pretend they're still together, for the sake of their adopted son's wedding. Watch as the sparks fly and punches are thrown in this new family comedy, also starring Topher Grace, Amanda Seyfried, Katherine Heigl, Robin Williams, and Susan Sarandon.