You probably have very little info on Elvira because her maiden name was "Tilley".She was my husband's second great aunt.(His line is through Elvira's youngest brother, William Henry Clay Tilley.)And I have your Andrew Thomas as "Thomas A.".I have a little more you can add on Elvira's side if you want to email me.
I've heard rumors there is Cherokee and Choctaw blood in the Tilley line, but I have not been able to find it.The only way Elvira could have been full Cherokee is if she was adopted, and I doubt that would be the case.But I haven't been able to go past Elvira's mom and dad, William Henry Tilley and Mary M. (Mattox) Tilley.