If you just type multiple sclerosis into a
search engine, eg google, you will get a
lot of useful sites, eg
http://www.Nmss.Org/.
The short answer to your question is yes,
ms can get so severe that you are no
longer able to work, and have serious
disability. However, everyone is
different. It is definitely worth
educating yourself about the various forms
the disease takes, and the different ways
it can develop. You should also not be
afraid to discuss his condition with this
man. He will, hopefully, appreciate your
honesty, and be honest with you in
return.
Good luck.