Then it occurred to me, “while watching one of my favorite ITV shows” that I could Airbnb a property some place hot like Florida for 9 months of the year and let my Grandmother and Mom stay there for free in the winters.

Lead exposure is especially harmful to young children and pregnant women.

Worldwide pandemics happen.They have occurred periodically throughout history and will occur again. 

In my state, abandonment occurs when money is owed and rent is unpaid for more than 15 days.

What's the harm in doing a test run with the tenant & keeping your dad as a backup? 

This is harmful to wild life and the environment.

My only hope is that a judge can see from the emails that this is a dangerous guy and believe me when I say that he threatened to harm me.My question though has to do with Virginia's Landlord Tenant Act.

@Forrest Williams it never occurred to me if the tenants could be income assistance.

If I am not entitled to the money by law is there any harm in asking him for the security deposit and pro-rated amount of rent for the month that was being charged or having my tenants nicely ask for their deposit and/or pro-rated rent back for the month they had already paid in advance?

Since you now know that illegal activity is occurring on the property, that a weapon was discharged and someone reported fearing for his life - your liability just increased.