I'd probably do independent living, and if someone needs medical assistance they can have home health aids come by.  

Go to an affordable college and take a subject you can actually get a job in (high tech, medical field, business) or don't go at all.

If its a business you can give him notice that he can not have a business operating in your residential house.You also might ask him about his own medical insurance or ask him to get medical and liability insurance to protect himself.

As a result of our success, my wife recently quit her job in medical sales and went full-time into real estate.  

I work on the healthcare brokerage team for JLL - we're a Fortunate 500 company offering commercial brokerage, management services, facilities, strategy, capital markets and so much more than I can feasibly list.My director and I specialize in physician and medical tenant representation, healthcare system real estate analytics, and general medical real estate consulting in Ohio but we also work across the Great Lakes Region.

This may be the slower road but it would only put you back a year.

There is a lot to be said for the stability of our market, or slower but steady pattern of growth here, especially if the investment property is being used for retirement income or if the stability of the investment income is important.

So if you sell it on 3/28/19....no gain exclusion unless you meet one of the IRS exceptions (being forced to move for medical, job relocation ect). 

If you do not have a workers compensation policy, the employer is liable for lost earnings and medical bills. 

It would require a hardship withdrawal (with taxes and penalties) and I don't see anything in your post that would indicate you are approaching that (medical, divorce in some circumstances, etc).