My sister is 17 years old. She is completely out of control. She is extremely verbally and physically violent to my parents. She had been caught abusing drugs and alcohol constantly. She has been caught having sex for drugs and money. She has shoplifted and even broken into people's homes and stole things. She has very violent outbursts towards her family and others. If she doesn't get what she wants she threatens suicide or running away. There's so much more... What can we do? Please help.