B.K.
Why are you meeting with this boy's mother? Didn't the facility already do that?
And what kind of a facility is this that 11-year-old boys are alone with little girls? Where were they that they weren't in view of an employee of the facility?
I would worry less about him being 100% supervised and instead I would 100% supervise my 5-year-old. That's way too young, in my opinion, to be running around any facility unsupervised. Someone should be with her every second there. If not you, then a facility employee.