Although I do not have your grandfather, Odbert Wilmoth, in my records, I think his father may be the Allen Van Buren Wilmoth I do have in my files.
Allen Van Buren Wilmoth, Jr. b. 20 Jul 1873, Barbour Co. WV, d. 6 June 1947, Fresno CA. Son of Allen Van Buren Wilmoth, Sr. and Hester Ann Thompson.
I do not have his marriage to Alice Poling, but do show a marriage to Helga Eleanora Funch, b. 23 Jul 1892 d. 3 May, 1970 - both in Fresno CA. [I notice that Allen's mother, Hester, also died in Fresno CA (no date), while his father died in Barbour County WV on 17 Jul 1912]
I show five children from this marriage: Clarence Allen, Lorraine, Floyd Troy, John Howard, and Harry LeRoy (no dates or places of birth).
If you think this is your family, I will be glad to send what records I have of their ancestry and descendants.
Contact me at firstname.lastname@example.org