If a recent graduate comes and their parents clearly say we will pay their rent, and both the applicant and their parents pass all our criteria (save for the applicant's own income), that is one situation that might work.

There were existing tenants and a lease in place - the lease had some issues (such as being rented to individuals instead of as one amount and with no parental guarantor tied to the agreement).

Just saw one trust recently that had parents as trustees and they're both dead and the trust did not name substitute trustees.   

You could review their OM's to see business tenant set up.I know Christian Brothers for the most parts has a corporate parent guarantee and then a general partner.

Other observations include a family with kids and the parents let the kids run around the house slamming doors, yelling, hands on the walls everywhere, and so on.

I do have more stable locations such as my company headquarters, where my parents live, and my old college town where I have connections and have been doing most of my price analysis'.

(Sold house, moving out of parents house, etc) as for evictions, those will show up on a background check 

In the future (if buying commercial properties) you should setup a new LLC as the owner of each property, and the member of each LLC can be a parent LLC that the cashflow flows up to, thereby making each new property's legal owner LLC a disregarded entity for tax purposes, while providing you liability protection for each asset in your portfolio and the bankruptcy remoteness that Lenders will require. 

Hey John,I have mentioned it to my wife, but I suggested to her that she should be the one to bring her family together to open that conversation to buy it from the bank, or buy it directly from her parents.

This property is a student rental, so would I also need to speak with their parents if their parents are paying for the rent?