It's All Relative (2003)

So you think Romeo and Juliet had family issues? Listen to this. Bobby is a bartender and the only son of gregarious, salt-of-the-earth Irish Catholic parents from Boston. His fiancée, Liz, is a toney Harvard medical student and she's Protestant (no, that's not the problem). Liz has two dads, not one, and they're a worldly pair of well-heeled gay men. The moment Bobby popped the question to Liz, they knew their families would have to meet. And the first time they brought his Mom and Dad together with her Dad and Dad... well, things did not go well. Aside from the obvious, there's a culture gap between these in-laws-to-be that makes the Grand Canyon look like a seam in the sidewalk. Liz's parents are devotees of the arts. Bobby's are devotees of the Red Sox. Liz's parents are into St. Laurent. Bobby's parents swear by St. Patrick. Did we mention that Bobby's sister, Maddy, loves throwing gasoline on the fire? From Craig Zadan and Neil Meron, acclaimed producers of the Oscar-winning Chicago.