I found a James Nathaniel Dismukes as son of Thomas Jefferson Dismukes and Nancy Emaline Hause in Bernice Dismukes book Dismukes and Their Kin pg 33.Bernice did not give a source for her information, but muke of what is in her book can be verified.
This James N. Dismukes was born 10 April 1876 and died 20 May 1930 in Barbour Co. AL (according to cemetary records posted on-line), making him 41 in 1917 the date you have for James N. Dismukes II.
I do not have a spouse for James Nathaniel Dismukes, but I would suggest starting the search in Barbour County AL records.
Thomas Jefferson Dismukes was probably born in 1829 in Macon County, GA.He and wife Nancy Emeline Hause had 10 children.
Hope this helps you start your search, Please keep me posted on any new or confirmed information you find,