The criminal background check and credit checks were clear, and the combined income is good, but the one landlord I have spoken to (others have not returned calls) just called me to say he had called the tenant (one of my prospectives) repeatedly since yesterday morning to let him know he needed to get in for a walk-through, and the guy hasn't called him back. When I asked this same applicant (who has a desired move-in date of December 15th) if he intended to honor the terms of his current lease, he took several hours to get back to me. He said he would, but why the hesitation? And why hadn't he notified landlord of an intention to move out on the 15th? This combined with the reported failure to maintain the lawn = unfavorable landlord reference. I'm rejecting the application. Thanks to all for your valued input.
But to return to my original question, I think a good thing to ask of the hosting family member is "What responsibilities did [applicant] have in your home? Did the applicant do his/her own laundry? Can you list any chores that were regularly handled to your satisfaction, such as lawn-mowing or cleaning?" I didn't get this far with this application, but it might come up again. I'm going to have some questions on file for the future. Any additional ideas would be great.