I laughed so hard at this movie: out loud, really hard, really often. Even if you are not a Vince Vaughn fan, you will still like this movie because there are so many amazing characters in it. The Four Christmases are as follows:
Brad's Dad - Mean ol' hillbilly Dad, with cage fighting brothers (Favreau and Tim McGraw), and vomiting baby
Kate's Mom - Sexy/slutty Mom and sister (Kristin Chenoweth is amazing) and inappropriate grandma
Brad's Mom - Dating Brad's friend, weird sex comments, uncomfortable
Kate's Dad - This gets a tiny bit sad/slow/reflective before the movie brings it home
Overall: FUNNY. Go see it. Sometimes these movies are too crude or too sweet, but this one is straight up great. Not a spoiler alert, but the couple attends church with Kate's Mom and family and I probably offended the person in front of me. I was clutching my scarf and bellowing into it.
I love you Vince, Merry Christmas you fast-talking-tall-drink-of-water you. You have given the world a wonderful gift: you.
PS: You can always read my celebrity friendly, overly nice movie reviews at Gossip Girls.