I'm going to my inlaws this evening. They cook everything with gravy, fatback, more fatback, and then they fry it. Not exactly conducive to losing weight.
Oh my, I know what you’re facing! I recently survived a family reunion with enough high fat stuff to sink a ship. My challenge lasted only one day. As rude as it may sound, I think I would take my own stash of food and snacks. Can you offer to help cook or will that be interpreted as an insult? When all else fails, I would probably just explain that I have to restrict what I eat and just pick out the things that will fit in your plan. After all fatback is called fatback for a reason!