If you haven't been sued yet, how do you know you aren't being scammed?
I would not sign anything. I would limit contact with these tenants as much as possible. Are these current tenants? Do not renew the lease and get them out.
If these tenants actually do have the gumption to sue you - which they may not - I would contact elder services, legal aid, and every attorney in the book from A to Z until I found someone to take the case.
