Now my RE agent told me that the aunt/ caretaker of the owner (who was living in the house), which is also in foreclosure, has decided she owns the property (without giving any proof) and has now hired a lawyer so apparently now it has to go to probate? 

Jones wants to sell me the property or basically the right to collect the balance of Ms.

The "new" collection company now owns the lien and the lien is still attached to your property.This could be a good news for you now that the loan is with the new company.

I would think you'd be relying on bullet proof disclosures, but my experience tells me there is no such thing, especially with some elderly widow.It's great to hear that you are an attorney and that you tailor to the needs of the individual.

For myself I do not even view applicants as people, they are a collection of facts and data. 

We own our own business but would like to build a portfolio of properties and start collecting passive income.  

I would pick the top 3 Brokers that you think would work for your business, ask questions that pertain to your business and will benefit your business and not just the Broker with fees, they collect.

A full package will consist of borrower's financials and proof of funds from the buyer with a fully executed purchase and sale agreement.

I notice lower end apps are focused mainly on screening tenants and collecting rent.  

If you have the money and not the time, hire pro researchers to pull files and collect and organize data yo your doecifuxations.