Look at what Rev. Kenneth Dupin of Salem, VA, has been up to. He invented a portable cottage that gives elderly loved ones a new home.
The occupant of a MEDCottage gets 12X24 of living space plus a built-in system to transmit vital health signs offsite to medical personnel and to family members.
Given that zoning regulations are adhered, a MEDCottage can be installed in the backyard of a single family home.