For the tightly wound Meredith Morton (SARAH JESSICA PARKER), the Christmas holidays are going to be anything but merry. That's because she's about to meet boyfriend Everett Stone's (DERMOT MULRONEY) family, and if her earlier encounter with his snarky sister Amy (RACHEL McADAMS) was any indication of things to come, it's not going to be pretty.
As the couple pulls up, Amy -- fangs fully bared - tells her family that she hates Meredith and informs them of her tics and other behavior. Her mother, Sybil (DIANE KEATON), also doesn't seem to like Meredith, but that's due to a combination of some bad news and the fact that she thinks Everett is going to ask her for her mother's wedding ring to give to Meredith.
Others in the family aren't as bad, with father Kelly (CRAIG T. NELSON) and his pregnant daughter Susannah (ELIZABETH REASER) seeming nice enough. Son Thad (TY GIORDANO) and his boyfriend Patrick (BRIAN WHITE) are also there, as is the more laidback son Ben (LUKE WILSON) who seems to enjoy seeing his family getting worked up into a lather.
In fact, things get so bad that Meredith eventually goes to stay in a motel, calling in reinforcements in the form of her more outgoing sister Julie (CLAIRE DANES). The fact that the family immediately likes her -- especially Everett -- only makes Meredith feel more uncomfortable, but she does her best to maintain her composure and try to fit in. With unexpected guests, such as Amy's erstwhile boyfriend Brad (PAUL SCHNEIDER), showing up along with unexpected revelations, this is going to be one interesting Christmas at the Stone home.