I spent the Thanksgiving holidays with my girlfriend at her sister's house. My girlfriend and I talk politics fairly often, since she knows that it's very important to me. We also share many of the same progressive views on most if not all political issues we've discussed. However, that is not the case with her parents.
To their credit, her mother and father are nice folks. They've raised three intelligent, friendly children, the other two of whom I would describe as left-of-center (though I haven't had many political conversations with the siblings). My girlfriend's family -- both her parents and her siblings -- have always been very cordial and welcoming to me whenever I've come to visit them. I would also add that they're very good cooks, and have made some great Thanksgiving Day fare. When it comes to politics, however, there's a much bigger divide.