This has only come to light now. Not sinister but could have been. Dd (was 12) went on a camping weekend with school pal (girl also 12), brother of friend (year younger) and their parents. For one night, the Mum was called away for an emergency todo with her own Mum. Dad left in charge of 3 kids. Sensible bloke. Or so I thought. Turns out, while he slept - separate area of big tent - the three sneaked out for what actually sounded like an Enid Blyton adventure- exploring some nearby woods to look for badgers. No one found out at the time ; they all got back safely. My dd fessed up when we were discussing camping. I told her she could easily have asked the Dad to supervise some nocturnal animal search. I also explained how much difficulty she could have got into. She said she had her phone but I doubt the signal was any good - rural area. I haven't told the parents of the other two yet. Should I tell them? I doubt this would have happened if the Mum had been there. Her emergency turned out to be not so serious- Mum's Mum had leaky pipes and got panicky. And should I let her go away with them again?