Samuel Oiler and his first wife Polly Caldwell had a son John Oiler. He married Mary Skinner. Their first child was Malinda Oiler, who married John Johnson; they were my great grandparents.
Malinda had a sister Sarah Ann Oiler (23 March 1856 - 24 March 1974) who married William Franklin McFarland in Gallia county on 14 August 1873. They had many children. Son Lewis William McFarland (25 October 1878 - 19 December 1961) married Louisa Shenefield in Gallia county on 30 September 1900. They had a daughter named Flossie E McFarland (10 October 1901 - 11 November 1969) who married Alva Cecil Oiler at Gallipolis on 26 November 1919.
Alva Cecil Oiler was the son of, or maybe raised by John J Oiler and Elva Ervin; I know nothing about this John and Elva.
Alva Cecil Oiler and Flossie Mae McFarland had twelve children, incluindg William K Oiler.
I have more information but it is too much trouble to type it all into the internet. I can send you the rest of the information by mail if you send me your postal address.