I contacted ADA
I asked them:
A housing lease restricts number of people living in a unit/house to two adults. Prohibits children.Family member requires live in caregiver.
Client is must (is required to) provide room and board.
May the client have the caregiver reside in the unit with the two adults?
Is it necessary to have a codicil added to the lease providing the caregiver access and housing.
The ADA does not apply to private housing
They recommend that the person put the request in writing, include medical documentation, include the section of the law if he/she thinks it will be helpful. If the request is denied the person can either file a lawsuit or file a complaint with the State Commission Against Discrimination
....not sure about the codicil. .... a written response from the housing provider would be adequate, but you may want to discuss it with a housing attorney.