Question for the momma boy spouses

I have a question for the ones who have child(ren) with mommas boys. You can be together or not…but when there’s something wrong with your child and your baby daddy runs off too his mom first thing to take care of the baby (not looking at you as the mom but his mom as the baby mom) how do you handle that? Is it something your cool with or how do you react to such a situation? Obviously she is the grandma but not the baby mom…or the doctor. Anyone ever dealt with anything like this before and how did you manage to put them in their places?