Her maternal grandmother was Helen Cleo Derryberry Garner. His parents were James Marion Derryberry and Henrietta D. Dollie' Furr. James was born about 1868. The grandparents were Anderson or Annison Derryberry and Elizabeth Felton. One indication is that his middle name was Marion.
Mysteries never cease.
I have in my data base John Dewalt Calvert and wife Sara Francis Derryberry. Kaye Cross identified Sara Francis as a daughter of William H. Derryberry and Sarah Alexander Gailbreath, which preume to be correct until more conclusive proof is presented. They, not being in my direct line, I have not tried to verify. Jayne says that John Dewalt and Sara Francis came by wagon train to Johnson Co., TX, along with Will Calvert and wife Mamie Derryberry. She found a Wlliam Calvert in the Caddo Cem.