the child is 8 months from 18
The child can move out unless someone stops them.
Criminal Defense Attorney
This question involve to terms 1) the age of majority in your state & 2) being an emancipated minor. You need to talk with an attorney in your jurisdiction who will explain to you what these two term are an how to proceed. Maybe there is free legal aid in your community. I have attached a avvo legal guide to get you started.