Having trouble finding info on a vacant house

[Kevin Koone]

There is a home next to a family member that's been vacant for 3+ years. I knew the owners so I've reached to both(they've split) through Facebook and have sent a letter to the address just see if anyone would answer.  No luck so far.  A realtor friend has looked it up and it has not been foreclosed.  Any ideas for me on how to figure out a way to buy this property?

Thanks