They respond that they were “waiting for us to send one” and request emergency assistance for the first two months which we receive and they are current again.Now, unrelated to the rent, a week or so after we get paid, we are in the lower unit painting and hear him screaming at her, threatening to hit her, furniture is being pushed around, and we hear kids crying.

Go with where your instinct is screaming!

I know many of your will scream at me for doing this so long, but i just never got around to putting those rentals in a LLC. 

I politely spoke to the owner Brent Voepel about it and he screamed at me.

Could be graffiti, gang signs, boarded up houses, loose dogs, undesirable neighbors (for example if people are out on their porches and look less than appealing or are outside screaming and fighting), lots of trash all over, a bunch of ancient vehicles, a nearby business or something that omits a bad odor, etc.

Youve clearly with this statement screamed loud and clear to us not to trust any opinions you have on the subject lol.

This post is screaming for the "Due Diligence" example finger waving.  

I'm a rookie wholesaler in the Inland Empire and I am on the hunt for those TLC/Handy-Man Special/Screaming Deal properties.

As I'm being dragged kicking and screaming intro the world of landlording.

Your post screams of someone who thinks inside the box.