She is unable to work as she is caring for her adult daughter and 3 year old grandchild who both are severely autistic.

Amy's adult son currently has a criminal case for molesting a small child of one of her long time employees and she spends her time hiding his behaviors, blaming and indirectly threatening the victim and the victims family rather than being a decent human being (not so Godly eh?)

Do they require each adult that will be renting to complete their own application?

In fact, I found out from my dealings that a lot of so called "vulnerable" sellers (those aged 80+ years, females and etc.) are often savvier than their younger counterparts.

I'd do five years and move back to Greece, sneak my savings into a Swiss or Liechtensteinian bank, spend my days on the beach with my adult beverage of choice.

I have two adult kids.

We have had the same situation both at an existing house and we even built a brand new house for a group home for mentally challenged adults. 

I mean young attractive females have the right to try to meet with experienced investors right? 

A quick call to a past landlord can tell you a lot.All adults should be on the lease and responsible for rent and damages.

But in general answer to your question (I'm in North Carolina, not South) - I have a provision in my lease that ALL person's age 18 or above (at the time of lease start or renewal) must have an application on file, that includes credit and criminal / background - and I have the right to an updated credit and background report from all adult residents prior to lease renewal.