No child support or anything? 

Weather related deaths same thing, infancy/child death, war deaths?

We have steady tenants, no real issues but at some point we will need to replace AC unit and make repairs as the years go on"2) What is your goal: passive cashflow, a paid off primary residence, saving for a future investment/expense such as a child attending college?

Neither time was I at fault for anything, but both were a painful experience.Once when adopting a child, during the time the child was in my home before the adoption, the board that was paid by the county/state for the child was miscategorized by the county employee as a salary for me. 

I am the only child but she’s legally married.

It's not unusual that a couple might bring a friend or relative with them during a viewing but in this case the deal was mom and dad, the married daughter and her husband and one child were interested in renting together. 

Who knew he was a rapist or child molester?   

Your very first comment out of the gate toward me put me on the defensive as you finger wagged at me like a child and accused me of illegal activity. 

However, it is my understanding that funneling funds from one child LLC to another as you suggest (even under the umbrella of a parent holding company) would still be seen as co-mingling. 

I have had families raise their children from infant to child old enough to move out.