Also, there is no mortgage on it, so it's only the tax sale situation, no foreclosure by a bank.I would not be able to fix it up, plus pay the 3 siblings significant extra money. 

My siblings and I were recently notified that we might possibly have claim to a real estate apartment inheritance where my former grandparents used to live.

The main goals with selling the property are to: 1.) shelter the proceeds from sales/inheritance tax 2.) alleviate the monthly expenditure to an outside landlord 3.) provide a long-term investment for both siblings 4.) shelter (by transferring of title) what has become Mom's sole asset from being garnished should she need long-term care (nursing home, etc.).  

Ask your parents, ask your aunts/uncles, ask your siblings, or ask friends.

You are correct: siblings, aunt, cousins, etc. are not considered 'disqualified', only immediate family members would.

Family doesn't really want to hold on to the property anymore because not everyone agrees on what to do with it (siblings eh).Appreciate any advice or explanations of our options!

For example: Parent died and child thinks they inherited it and can sell it but doesn't realize their other siblings or family members may have ownership interest in the home.

my understanding is that you can't sell it to yourself or your llc, or your son/daughter/parent/sibling. 

A couple days later, I heard back from the neighbor, saying that after consulting with his siblings, he would be happy to sell the house at my offer price.  

Actually, all of my siblings and my parents are now investors or currently looking to start.