OP again, what happened with the injury was the youngest and the second youngest decided they were going to race across our living room, and the former ran headfirst into the edge of the coffee table. Hard. Those two had walked into the kitchen while the rest of them were watching a movie at the time and I don’t think she noticed what they were doing until it was too late. He got a cut that was about an inch or so wide and looked pretty deep on his forehead. We were able to bandage it up, she got the bleeding to stop and confirmed he did not get a concussion from it but everything I frantically searched online said he was going to need stitches and all of the local urgent care centers had literally just closed 5 minutes before this happened. She took him the next morning when they left and they said he was OK, thank goodness, but a very brief lapse in supervision wasn't something to call CPS over.