Thank you for sharing your story. I don't know the severity of your brother's disabilities but I believe that there is a potential place for him as a teacher to teach introductory courses (like JS basics, html, etc). The daily interaction someone like your brother might have with other people might help with his mental disabilities.

Just a my two cents, but I'm not trying to advocate for everyone to learn coding though. Simple jobs will always be there in the near future for those who need it. I just have a problem with people who are capable of a skilled jobs being forced into simple jobs because of financial reasons.