A lease option would work but there's a mental thing to still owning and now an older seller is being asked to trust a stranger with their asset.   

.- I am sympathetic to what I believe are real health concerns by the tenant's parents, but i can't figure out how they can be tied to the house based on the mold test results or visual inspections completed by the management company's maintenance team or abatement company.- based on what I feel was an unreasonable counter I'm not sure how to frame my response to the tenants.My questions for the BP community:- Could I be missing something causing real health issues?

However, their health issues may squeeze them financially.  

Yea its definitely been a mental jump to make the decision...but it has been decided 😉Thanks everyone for the thoughts and advice.

He’s been living down the street with a neighbor for over a year due to some health issues with mobility.

I can think of only two things that rise inexorably and never fall - college tuition and health insurance costs.  

You just have to have the right mentality and the develop the skills over time. 

There is VERY limited housing around here, so people who have housing vouchers can hardly find a place to move into and those with mental health are essentially screwed.

I suppose this could happen with any seller regardless but I am also concerned given his age and ill health, what if at the time of purchase his interest in in probate or held by surviving family? 

To cover myself, I added the following provision to my lease..."... when needed to water the grass, Tenant agrees to allow use of their paid water to maintain lawn health and appearance as needed."