Someone else may have said this but:
1. Get to a family attorney and get legal custody of your nephew so they can't drag him back into a violent/abusive situation.
2. Get your nephew into counseling or at least reading some
JohnShore.com.
3. Set up a paypal donation account to pay for the above 2 expenses. There are many of us out here who can kick in a few bucks and that will help.
4. You rock. I would have given anything to have had a family member take me in when my parents booted my queer ass out in high school. You are saving a life.
Seriously? MOOCs are undermining the quality of a college degree? Have you been on a campus in the last 10 years? Money has been sucked out of the classrooms and poured into administrative overhead while tuition skyrockets. A MOOC is as interactive as a freshman survey course gets at most schools and a heck of a lot cheaper. Bring it on.