Trying to get an inherited tenant (94 yrs old) to sign new lease.

[Justine Scheuher]

I've inherited a 94 year old tenant who lives with her son and daughter (in their 70s-80s). I'm not quite sure what to do...they have been month to month. Only the 94yr old is on the current lease. Should I just keep it that way?

I tried to get everyone to sign a new lease (same price), but it got complicated...the OTHER (younger and healthier daughter who doesn't live there) said that the siblings that live with her mom don't have any income, hence why they won't sign the new lease. Rent is paid by the elderly womans social security check. 

But i want everyone living in the house to be on the lease right? That way if their mom passes away, they are responsible for paying rent..right? OR should have the the younger daughter (who doesn't live there) co-sign on the new lease? 

How do I find out what their plans are for when their mom passes away-----ex. who will pay rent? or when will they move out? who will clean out the place? etc. 

What did I just get myself into?! lol