2 brothers in my local park today aged 8 and 10. One really hurt his foot and had roller skates on. They lived a good way away and no way could he make it home.
Somebody went and told parent but not until poor child had suffered half an hour shivering.
I stayed with them till parent arrived, who was so thankful for the help to her dc.
If they had a contact number things would have been so much easier. Also they were in a very unsafe position. If the other adult hadn't had a car we would still be there waiting for her to turn up. I couldn't have left the kids and the older brother new it was unsafe to leave his brother with strangers.
So AIBU to expect parents to give their dc a contact number.