In the end a credit score based on a sufficient credit history tells you the risk of default which is what you should actually be concerned about.

I was concerned at first.

The issues being  1) inconsistencies in roof (dont know what this means)  2) a hole in the drywall behind stove in kitchen because of which there are spiders coming out of the wall and they had to kill two of them.At this time, I am concerned that they will trash the house while leaving it.

Before you call any family service, how about meeting with them and expressing your concerns. 

@Noah SchulzThe previous owners' failure to disclose a back-paying arrangement complicates the situation, potentially leading to tenant disputes or security deposit concerns.

It requires significant work, and I'm concerned that some additions made by the previous owner may not comply with building codes.

Are they interested or concerned about neighborhood crime, supporting data for surrounding rental rates that might affect your future cash flow, pictures or video of the property showing the class of the neighborhood and the property itself, ... ?

When you're on a temporary visa, especially without a clear path to permanent residency, the risk involved can be substantial—both financially and legally.

I believe there maybe a few different ways to tap the equity in my 1st rental, but my concern is that if I take out the equity for a new purchase, I'll be reducing the cashflow of my business due to the additional debt repayment.

I’ve seen people open carry (not here in Los Angeles of course) and I always get the impression they are more concerned about making a statement than they are about protecting themselves.