Did you ever find out anything for sure on this? I am in the same boat with my son and trying to determine what documentation I need to classify him as disabled. I have all sorts of information from doctors and providers stating his disability, but I'm not sure if that is enough. Also, the gainful and substantial work is so confusing. He made over 4,700 last year but can't hold down a job and did jobs that normal people wouldn't be paid for (like tearing bubble wrap).
