@Sarah Bachman The sibling relationship isn't that big of a deal, but like @Ronald Allen Barney said, the fact that they didn't tell you about the code violations is a major red flag.

I want to be a role model for my younger siblings.

When your parents died, even without a will, the court would have gone through probate and you could have inherited the property then or it would have been sold and you and/or any other siblings would have split any equity. 

I have no family much anymore no parents passed no siblings that help answer these they are mostly in jail or on welfare so I’m pretty alone in my venture and I want to be a successful  financially savvy and well off woman!   

Her 2 siblings have no interest either.The rub is this:-Buildings are priced really high for the area in the condition they're in ($315,000 together)-Seller has her adult son staying in the rear unit charging him and his wife about half of market rent ($525 currently)I am seeing my numbers work out (FHA 3.5% down, living in the vacant apartment above the office, still paying $500 or so to live there) around the $240k-$250k range.

You may also want to request a copy of the death certificate Account Closed.Whom ever filled it out will be your first point of contact (Sibling, neighbor, close friend, pastor, etc.

Even parents who are on a fixed income but have their mortgage paid off, or siblings with another source of income...

If I were in your shoes I would tell the town you were told they were siblings and you don't question familial status as it is a protected class. 

I think what will probably end up happening is you will not be able to go get a loan by yourself and you will have to get someone to co sign on the mortgage (parent, older sibling, friend, someone  who has good credit and work history).

Parter with someone to bring the money or be a co signer on the mortgageThis could be a parent, sibling, friend who is more finically stable and the banks will feel comfortable giving a loan to.