I have Dockery's on my Grandfather's and my Grandmother's side of the family. This line of Dockery's came from Cherokee Co., NC. In all my Dockery research I have read of James William Dockery and Tabitha Lunsford. Have you heard of the book "Dockerys in Dixie"? The Dockery Family Association has published it. You can contact Bill Allen at email@example.com
and he can direct you to all sorts of info on the Dockerys. Currently there are over 400 Dockery cousins in this Association. Welcome. I hope this helps. If you need more, just let me know.