Am I overreacting

I have to get my wisdom teeth out tomorrow and his mom is going to watch my 2 kids 2 years old and 8 weeks old and then my SO is going to be there waiting for me while I get them done. Well, he called up his mom and mentioned that I’m getting them done and if she can still watch them and mentioned the park I don’t want her going anywhere with my kids because she doesn’t know anything about car seat safety she has put a heavy ass jacket on my daughter while being in the car seat, and that makes the straps loose as hell, and she’s going to do the same with my 8 week old as well.