Jealous MIL?

How do y'all deal with a jealous MIL?

Mine is upset because my grandmother invited us to church and lunch after church and now all of a sudden my MIL has plans to cook and is guilting her son to stay home because he feels bad lmao. I can't. 🤦🏽‍♀️🤦🏽‍♀️🤦🏽‍♀️🤦🏽‍♀️