Don Griffin (Robert De Niro) and Ellie Griffin (Diane Keaton) have been divorced for quite some time. When their adopted son Alejandro (Ben Barnes) decides to get married, his biological mother, who lives in Colombia, wants to come to the wedding.

The problem? She's Catholic and doesn't believe in divorce, so Don and Ellie have to pretend to still be a couple in order to smooth things over, but that proves to be more difficult than they'd imagined.