We have probably all been to a business or two where the young kids are working along side their parents. Their taking orders or making food. Working right beside their parents. By choice, its unclear. It begs the question, should this be allowed? Personally I don't think so. I was in a restaurant the other day and the kids were working after school instead of being able to just be kids. I think it happens far too often and needs to start being addressed. Sure, if they are 15 let them work if they want. But younger then that, and they shouldn't be there. It also needs to be by their choice, not being forced upon them.
This is talking from a legal perspective for the most part. Could also be ethical.