I have holidays like this too. Everyone is either married, has a kid, or over 55.
I always try to get as current as I can with football stats so that I can talk with the other men, way past their own athletic prime, about fantasy football and other lame stuff like that. Also, I plan on grabbing a beer or 5 with them too, as it helps with the conversation, and you might be surprised at how much you have in common with them once they open up. Avoid spending too much time with the women, you will feel pathetic, and it is time to find a way to relate to the rest of your male clan.
If you make the effort, it could turn out pretty fun. If you don't you will do little more than survive the holidays.
And to the poster that told the OP he should count his blessings that he is not overseas in the military: It's true, he should appreciate his family, but at the same time ours is a volunteer military. Everyone there knew what the deal was when they signed up for the job. If they decided to make a career out of military service and expected to never be deployed, or have to be away from family, or be put in harm's way, someone at the recruiting center lied to them.