It looks like your having as much luck as I am on this side of the family. I hope you get this email, I may have a connection. My Grandmother was Margaret Alice Jones & it shows a Bertie listed in her family. I believe the family was Comanche but not sure. I've seen pictures of Great Grandpa Jones & he is Indian my mother was very dark also. I took after the Irish side. I hope you get this.
Janna