I re-read your thread. Yes, he can be ordered to get a job...but that's not really worth much. What is worth something is that he can be ordered to sell his stock. It sounds like you need that, so ask for it and back it up with the numbers...from the past and future needs, such as tuition and etc, parental loans etc.
You don't need to protect him or cover for him anymore...your kids deserve all the help that is theirs and so do you.