There is an issue here with my children's safety, otherwise what would be the point of asking the volunteer to not be in the classroom anymore. If you truly knew the whole story you'd understand my concern. I want my children to goto school learn and play peacefully with their friends. This is not happening. Grandma is one reason why, the permission slip is another reason she shouldn't be in the class.
I do agree with you both actually. But yeah, it's not about the safety of the child - that is crystal clear. That's why I see a miserable future ahead.