Re: drugs, alcohol, stealing, gangs
I think the cousin who tipped off the family about the boy's behaviour did all that she should have. She warned his family that they needed to pay closer attention.
What coudl they have done differently if she had laid out the extend of the truth? He had already successfully hidden his activities from his immediate family, and clearly had a desire to continue with it. All he would have done is pretend to reform, and just hide his behaviour from both that cousin as well as his family. Nothing would have turned out any differently - only now nobody would be in a position to so much as warn about his behaviour.