If he has caused actual harm to someone at the property, or threatened to cause harm to someone at the property or physically dome harm to someone’s property then he can be evicted.

He has not been returning our calls and threatened our local guy on site.  

After that I always tell the renters to call the police when there is any issue that they feel threatened in. 

I'm not at all against helping out your kids to get their feet on the ground financially, AS LONG AS it doesn't potentially threaten my own welfare. 

No competitors will threaten your investment as much as your own lack of interest, laziness, or ineptitude. 

And she threatens to report us for mold and fire hazards.Fact: we fixed things she reported and for the past four years, she was a pretty ok tenant. 

When I make contact with a homeowner in foreclosure I explain to them in a non-threatening way that they have two options:Option #1: Do nothing and let your house go to auction, which will wreck your credit, put NO cash in your pocket and NO time to find a new place to live and move out with dignityOption #2: Sell to me (or someone like me) that can stop the foreclosure, give you cash at closing AND give you 30-60 days to move out.Which option would you like?

We stopped collecting late fee and reduced the rent as we were all facing difficult times and agreed in writing once the states opens up we would return to regular rent payment as stipulated on the lease.I required some documents from him to confirm he was out of work and his document showed he's been out of work since November.We've not received any rent since March, i reached out to him and he complained he was holding back rent because there are things in the property that needs to be fixed threatening to call an inspection officer to the house.

Give the neighbor a written warning threatening to sue her for losses if she continues to affect your rental/income.

Quote from @Sami Gren: As long as they retain possession, they are legal tenants and you can't change locks, throw their stuff on the street, etc.I would contact them and give them 48 hours to remove their items or threaten to put it in storage and hold it until they compensate you for the extra rent, utilities, moving, and storage costs.