The research I have from my grandmother says the wife of Nathaniel should be Mary Wilson, but she has not noted her sources. Her great-great-grandmother, Frances (Fanny) Barton Black (m. John Black) was the daughter of Nathaniel and Mary.
Children of Nathaniel and Mary:
Hiram (May 18, 1821, Ga.)
Frances (Fanny) (1826, Ala.)