@ddon @kayabbott gave you some great pointers! Visiting family like that is so good for you, but having to forego food that is not healthy can be a challenge. If you can, maybe have a small portion, very small! Opt for getting salads out on the table, and fresh veggies. If you are headed to someone's house, eat ahead of time so you may be less tempted to indulge in the bad stuff.

Often when we are at a potluck, I will put just a tiny bit on my plate, so the others know I am not forgoing the food. Maybe a bite or two. And usually that is enough for me. Can you try this?
Ginger