It doesn't sound like a quarrel between tenants. 

If you have someone disgruntled and then you hold back a security deposit for damages you may be setting yourself up for a quarrel.

Also largely about getting it at a price where you can wholesale it to someone else at a price where it’s “a deal” for them, about the 70% of the ARV, example: If the cost of the repairs is $450k, and repairs are $60k, then you could offer $450x.7 -$60k = $255,000Listen to Podcast 70 with Michael Quarrels about talking their answer out of them, he’s got a follow up episode too.

We have NEVER had a quarrel over one of us working more than the other, one of us not holding our own weight, etc.

Two of my neighboring tenants in the 4-plex quarreled, caused by small kids from one family playing and making some messes on the other family's front yard (the complex has open front yard), then verbal exchanges from adults.The family with small kids (7 and 8) just moved in over a month.The other family (late middle aged with 3 teenagers) moved in almost a year, and are very good paying and quiet tenants.

I'm guessing when you've done enough calls you don't even remember the rude ones. .. unless they are like that Michael Quarrels voicemail example

You should listen to the podcast with Michael Quarrels.

I’ve had tools i my hands before I could even walk.I’ve also watched mother quarrel with her sisters over ownership of raw land coming from a grandparents will.

@Dan Smith if you and he are going to start an LLC, just make sure you put everything in an operating agreement, this will break down who does/gets what and that way there is no quarrel if something goes wrong, you can update and change these at any point. https://howtostartanllc.com/learn-the-basics/what-is-an-operating-agreement here's a link, though you already sound like you have the know how.

I would hate to win the auction and then get into a quarrel with the person living there and cause them to destroy it while moving out.