I am glad to find another Tullos relative and would be glad to exchange information on that family. I had wondered what happened to Sibbie Anne and her mother.
Robert W. Tullos died in 1914 and is buried in Fellowship Cemetery in Winn Parish, Louisiana. I do not have a Harriet/Rebecca (born abour 1850) in my Southern information. I do have a Rebecca Womack born aabout 1844 Louisiana, daughter of Robert Womack and Rachel Wrizopa Southern but this Rebecca married someone else. Could Harriet/Rebecca be the daughter of Lewis Southern & Elizabeth Hall. I do not have a list of their children. You mention Cherokee ancestry but could it be Choctaw ancestry? The Foster family of Jackson Parish has a connection to the Womack & Southern families. The Fosters are of Choctaw ancestry from Mississippi.
My Ramsey family of Bienville & Jackson Parish are part Cherokee but they did not come to Louisiana until 1880's. It might help to check out the Impson family (who had a daughter named Harriet) and see if they have a Southern connection. I will gladly share what Southern information I have. They are not a direct line for me but my g-g-grandfather, Thomas Anthony Pullig, married (as his third wife) Missouri Southern. Thomas A. Pullig's daughter from his first marriage married Rev. Elbert Elmo Southern, brother to Missouri. My maternal grandmother, Beulah Inez Busby, grew up in the home of Rev. Southern and his wife. I visited the Southern daughters when I was a child but wasn't sure of the exact relationship at the time. I called them "aunts".
Bettye Prince Gilbert