I had a different but similar experience,
When I was about 11, my Grandma brought a little boy up to stay at our farm for a bit, his Grandma (who was a friend of my Grandma) was looking after him, because the parents were to un-responsible to look after him. He was a nice enough kid underneath then, but outwardly, wayward & hard.
I don't know what happened to him after that, as he went in to foster care.
But somehow I think, that I don't really want to know, the way he was when I knew him....
It really makes ya sad.
This sort of thing makes me appreciate that I have decent parents & way they brought me & my brother up, sometimes I thought they were tough, but looking back now it paints a very different picture.