My son refuses treatment for mental illness. How do you help?

Sadly - this is a really common problem with psychosis / schizophrenia. I recommend your entire family watch these videos and get the book - and just keep working at getting him treatment. All the families here know how hard it can be.

As you may know - the sooner he can get treatment the better the recovery.

Have everyone in the family read up on “First Aid for Psychosis” here:
http://www.schizophrenia.com/sznews/archives/005561.html

and watch these videos below:

and

and read his book too:

and check here for a local early psychosis evaluation and treatment center - for when he finally does get more receptive.