@Zoffiel,
My step son (who has lived with me since he was 7) got ousted at 17. We had no other choice. Constant phone calls from the school, teachers turning up on the doorstep etc. We let him quit school and get a job. That didn't last long and he got the boot for not showing up.Then he hooked up with this not so nice girl and together they were Bonny and Clyde.
Neither of them would get off their arse and work, so he decided it was easier to steal everything that wasn't nailed down from us and hock it. Cash, farm equipment, dvd's, my jewellry. Even a big order of star pickets that had just been delivered vanished overnight. He wast taking things from out clients, we had to install security cameras in the stables etc etc etc. It nearly broke my husband's heart as they had always done everything together. Then we just got angry.
He denied it constantly, obviously thinking we were totally stupid, so we had to kick him out. 12 months living in a crappy caravan out bush with his girlfriend made him get his shit together.
He eventually got a cabinet making apprenticeship, rented a house and came over and admitted what he'd done and apologised. The relationship is now very good all things considered.
Hard to do? Absolutely. But it did make him grow up rapidly.