If feasible, stay in a hotel or at your in-laws. Visit with your family but do not eat meals at their homes. Be agreeable to meals out where you can control what you eat.

My sister has a toxic mother-in-law that sounds like your mama. She (the MIL) pushed until sister, her husband (MIL's son) and their daughters have nothing/nada/zero/zilch to do with her. That's a sad thing to have happen and it sounds like it could happen with yours, too, but you are being saved by distance.

Good luck with this one, deary. Sounds like you need it.