Advice for a smooth transition from family home to rental property.

[Chad W.]

Hello folks, long time no write. I am here today to ask for advice while giving an update to one of my first BP posts from 2012 which you can find here.

Quick recap from the linked post: My grandmother and my cousin are currently living in the home that I own along with my grandmother (joint tenancy.) In 2012 we took out a mortgage on the payed off home to pay off some debt run up by my cousin and to fund down payments on two rental properties in Memphis from which income in turn would go on to cover the mortgage on the home.
 
Fast forward to 2015 and both Memphis properties are PAID IN FULL and flowing nicely. There is still a mortgage on my grandmother's (our) home which I pay. The cousin has now transitioned into a home care giver for my grandmother who is bed bound and suffering from dementia. This will soon change as my grandmother needs more care than my cousin can give so I am looking into moving her to a local board and care facility and renting out the home as my cousin cannot pay for any of the utilities, etc. My grandmother's fixed income will go almost entirely to the board and care facility.
 
So, to wrap up, I am now looking at ways to gently transition my cousin and her kids into a new life and out of the house she has been in for the past 13 years or so. I am trying to help, but there is no way I come out of this as anything other than the bad guy. I simply cannot afford to support her and her kids and pay the mortgage, utilities, food and maintenance on the house once my Grandmother is no longer living in it.
 
She has agreed to move out once my grandmother has entered board and care, but I am still nervous that she will change her mind after she enters care and I will be on the hook for the board and care and all of the expenses with the family house which I frankly cannot afford.  

Any advice? Lawyer up? Cash for Keys? Hope for the best?