but meh - please explain to me what it could hurt if it happened?
duh. because the other boundary needs to be broken first.
and that would be an automatic OK to move back in the house. trying saying NO after she says YES. you can't even get her to show you her call log history.
and one other thing, the fact your son is begging and screaming for his momma and the best you can do is have her come over to calm him down shows that she is the primary care giver; and despite the he-man and duck dodgers in the 21st century making his wife pay child support BS, you really shouldn't mess with the natural course of things for your son's sake.