I'm worried about my son - How can i help? (Fairly Long)?

It's called "Tough Love." He is contributing nothing to society, nor has he any plans of doing so. I am so sorry this lot has been dumped in your lap, especially with your son, but dear, this is going no where fast (or slow.) It is time to pack up his bags, put him on the street, and change the locks! He needs to find out what life is all about, and it is NOT sitting doing nothing, expecting others to support you. IF he is as smart as he thinks he is, he is throwing away a given talent. Sad. In any case, he is no longer your responsibility, and the longer you put up with this, the worse he is going to be. GW