Does a family member who is a live-in caregiver have to pay rent?

My 90 year old mom has Alzheimer's. I have been her live-in caregiver since 2010. The landlord, who is my brother's wife I s now trying to evict me. Does she have grounds, since I am not a tenant? My mom was not capable of putting the utilities in her name, so I processed applications in my name for them. I am responsible for paying all of these bills as part of my caretaker responsibilities because my mother does not have the capacity.