Strongly suggest that you ask an attorney who ONLY handles Social Security cases. The initial consultation is free.
The attorney will advise you on your son's chances of collecting Social Security Disability benefits.

"To qualify for benefits, you must first have worked in jobs covered by Social Security. Then you must have a medical condition that meets Social Security's definition of disability. In general, we pay monthly cash benefits to people who are unable to work for a year or more because of a disability."
http://www.ssa.gov/disability/