The Big Wedding (2013) on Netflix

Don and Ellie were once married and have two children, Lyla and Jared. They adopt a boy from Colombia, Alejandro. Eventually they would divorce, Ellie would move away and Don would hook up with Bebe, Ellie's best friend. When Alejandro is about to get married, he informs Don and Ellie that he never told his natural mother who is so traditional that they got divorced. And she is coming for the wedding so he asks them if they can pretend to still be married. Don and Ellie reluctantly agree to it and Bebe moves out who is also upset that Don doesn't want to commit. Lyla who is married is going through a rough patch in her marriage. And Hared who hasn't had much luck with women finds himself attracted to Alejandro's extremely sensual sister, Huria.