I can barely survive 3 hours with my sister-in-law today, how am I going to survive 5 days over Thanksgiving?

The holidays are coming up, and for many like me, this means family time. I have been married for 7 years and for the most part, my in-laws are ok. Not the best, but not as bad as the horror stories that I have heard about. Still, my sister-in-law drives me INSANE!

Her biggest problem is that she and her kids MUST be the center of all attention! I spent three hours with her family today and I wanted to die. An example out of the blue is she will say things like "Isn't my girl the cutest girl ever?" or "It's impossible for children to be cuter than mine." The grandparents will agree, and it continues on from there. What really pushed me over the edge today was when we were talking about how cute my baby smiles and she butts in and says, "Is that all you are going to talk about today?" I couldn't believe it! Just ignoring her is one thing, but it is really rough for my kids because their grandparents don't give them the attention or time they deserve because she is always: "My kids, my kids, my kids." So my dilemma is thus, we have to go for Thanksgiving, there is no getting out of it. I see my options as being 1.) tell her off and enjoy the rest of my life as the villain. 2.) put aside all manners I have and act like her and be as annoying as can be. 3.) just ignore it. 4.) one of your suggestions.

Anyone else dealt with this sort of thing? Also, I usually get so pissed when I am around her that I just sit in silence or act really ornery, which results in me being the stick-in-the mud uncle who is no fun. It really sucks and I get 5 days of it in two weeks. :(