Marc, Since your posting is over a year old, I hope you are still involved in this search. Your Grandfather Elmon was my Grandfather's (Homer Sherwood Kerby) brother. I may have met your Grandfather, when I was a child. Was he the brother with the bank?
William Greenberry Dossey's wife is a real mystery woman. She was a Cherokee Indian, but I can't even find her name anywhere. They had several children together, so we are part Cherokee, but the rest of the Dossey family apparently was not exactly proud of that fact. If you find out anything, please let me know.
I have Amanda (Dossey) Kerby's middle name as Lila, are you sure of your Lela spelling? I met her and Grandpa Kerby (I was named Thomas after him) in Buffalo Gap, Texas, as a child, but never (of course) bothered to ask her middle name. Contact me. We aren't getting any younger.