Been through the whole thing with a girl and a boy. It's stressful and it sucks. Take away everything they love, make their lives miserable, that's about all you can do. They will hate you for it for many years. But, if it gets them through school, it will be worth it in the end. When they are older they will understand why you did what you did and will be grateful you cared enough to try to help them through. Mine hated me and wishes I was dead. They both graduated high school and the girl currently works in collections and the boy is working towards his journeyman electrician certification. What I did didn't scar them for life or screw them up. Today, they are 25 and 22 years old and have thanked me countless times for doing what I had to do to keep them in line and focus on graduating.