The TAX statement means SQUAT. You need someone to go over the recorded land records. A title company will be able to do that, though the attorney handling mom's probate may be able to have the research done as well.
The estate should have either filed the death certificate if the property was a survivorship issue or deeded it otherwise.
Understand that unlike a car there is no one "title" for the property. Each act that transfers ownerships (deeds, or death recording in the case of survivorship rights), is just one step in the chain.
Most government employees are not legally allowed ot just give you answers as they are not attorneys and can't play that role.

