Could You Discipline Someone Else's Child?

You can teach discipline to someone's else child but keep in mind the maturity level of that child. He might abuse you on that. A sensitive and intelligent child will always listen to you. Adamant children are very hard to teach. In my opinion, you must step in such a way the child don't dislike it. Make him realize the mistake, he is making and what will be it's consequences by giving him an example.

A risky thing to try is to tell another persons child of for misbehaving. Even with the best of intentions an irate parent could react badly and situations such as this have ended in murder. Best not to interfere.