I am related to Viola Harrison, daughter of Alexander and Margaret Tyson Harrison. Viola married Andrew Jackson Davis. Their son, Truman Alexander Davis, was my grandfather. I, too, am looking for the parents of both Alexander and Margaret. Would be happy to share information that I have. I have only been able to find Alexander once on a census..1850...in DeKalb County, Alabama. Margaret was alone with her children in 1860 and 1870 census'in Madison County, Arkansas and I never have found her in 1880.