Is there a better way to help my friend?

I have a friend who worked with me for about 15 years. About 12 years ago, he became unable to work. He and his wife both have multiple sclorosis, and the desease has them both bed ridden now. They have a son who is now helping to take care of them, but is too young to be able to support them financially.

When my friend stopped being able to work due to his illness (hes currently unable to move anything but his neck and face by himself, but still searches the web with an adapter for his mouth), I started helping by paying a portion of his rental, since the disability and state support wasn't enough to have a place for his family to stay.

Rent in the town we live in kept going up, so I found a detached 2 bedrom condo and purchased it, with my friend paying the 700.00/month that he gets to help with housing, and me paying 1,000.00/month for the rest of the mortgage loan and homeowners fees. When the housing market crashed, the property value went upside down, and my business took a major hit, leaving me struggling to make my side of the payments.

I'm stil hanging in there, but if there is a better way to help my friend to have a place to stay, I'm very interested in hearing it.

I went to a seminar and am willing to discuss my thoughts about it in private. Needless to say, I'm on this site, and writing this in the hopes I might find a better solution than what I am currently doing.

Thank you all for any comments.