In this instance, I would enjoy the dispute and clearly will not be backing down.  

I would get rid of that immediately.Second, I would ensure your rules are clear, in writing, attached to the lease, and posted in locations where the occupants can't possibly miss them.

The property currently has a mortgage on  it, but it should be paid off during the sale as my parents want to own the property free and clear. 

If they are, they should be able to clearly and confidently explain how they added value in that transaction. 

It sounds like you have a solid system with clear communication on extensions and vacancy openings.

But to be clear, I have never taken any subto training as its not something I have interest in doing 

Some landlords have requested cameras (they being responsible for setting those up if they want them) or already have cameras installed, but you want to make sure any prospective tenant is fully aware cameras are actively recording and it's clearly communicated to them.

You're clearly don't comprehend well.

I also got on a call with FlipSystem with a rep, who turned out to be Antoine's girlfriend (that wasn't disclosed during the call but it's clear from the social media posts she's his gf).

If they're late multiple times and or declared bankruptcy, then I would expect them to continue, unless they can provide some clear explanation.If you're having problems renting, it is either a pricing, condition or marketing issueGood luckGino