Whatever else you do, if one of these kids is ever injured again and says they can't go into their own house or wake up their mom, go ahead and call EMS. I agree with the person who suggested that, because of course EMS won't do anything without the parent's permission, which will mean the mother will have to get involved with her own kid. And yes, she may get angry and she may even punish the child, but the children are being neglected badly and probably abused already, plus an emergency medical technician isn't going to be blown off as easily as you might be, and they are required to report abuse. And -- just a thought -- not to stress you out or anything, but you do have liability insurance on your property? Most homeowner's policies include it. You are wise in any case not to let these kids in your pool. Good luck!