This might come across as blasphemy, but your family should come first....well at least your wife and children and your parents. Let them cook and eat whenever they please. You have the choice to be a part of it or not.
If the game is that important to you, they will already know you, and understand. They will not feel slighted that you have to excuse yourself from the family gathering to watch your game.
So I say, do your thing when it comes to watching the Boys and not eating, but do not make the rest of your family compromise.....that is just downright selfish....and quite frankly, if I were a member of your family, I'd tell you were to stick it, then I would start eating.
During Christmas, we all gather at my sister's. Well, I gather in her bedroom and snuggle up to the TV and whatever sporting event I can find....hopefully a good college bowl game or two.
BTW, my biggest pet peeve........people who walk in front of the TV, stop, and start conversing.....during a game. In my family, it is always women, and I know they do it on purpose. I can see having to cross in front of the TV, but do so in between plays or on commercials...also, do not make haste...get out of the way as quickly as possible and then have your meaningless conversations.....cause in all honesty, when the game is on, the only meaningful conversations are those that involve the team I am rooting for at the moment.
one more thing........CBS better not have drag on its HD feed today.....I will be ticked.