Name: John RANKIN
Death: AFT 1870
I don't have proof that this was the father of Martha Lucy Rankin, but all the evidence points that way.
According to LDS, John F. Rankin born in 1854. The 1870 census shows John F. at 14 years of age (therefore born 1856). Tabitha Rankin was widowed by 1880 census - six year old Lucy living with family.
John and Hettie were divorced sometime before 1880. According to Aunt Lucille's genealogy notes, Hettie shot John because he cheated on her (need to verify). It is possible that John Rankin remarried, as suggested by the following 1880 census entry:
1880 Census Place:Head Quarters, Nicholas, Kentucky
Source:FHL Film 1254436 National Archives Film T9-0436 Page 392A
Occ:Farm HandFa: KYMo: KY
Occ:Keeps HouseFa: KYMo: KY
Fa: KYMo: KY
Occ:NurseFa: KYMo: KY
Father: James T. RANKIN b: 28 MAY 1830
Mother: Tabitha SIMS b: ABT 1836 in Kentucky
Hettie RULE b: JAN 1852 in Kentucky
- Martha Lucy RANKIN b: 17 FEB 1871 in Kentucky