Based on information maintained by the Hatcher Family Associations, John Franklin was the son of Charles Franklin of South Carolina. Based on John's birthyear of 1791 the indication is he was one of Charles' sons in the less then 10 birth range in the 1800 Edgefield County, SC, census. He would also likely be Charles' son in the 16-25 birth range in the Newberry County, SC, 1810 census.
Based on the Hatcher family records, John married Susannah Hatcher and they left SC around 1820. John's first three children are listed as having been born (1813, 1815, 1817) in Newberry County, SC, and his next child (Gillis) was born in Illinois in 1822. By 1850 John and Susannah are living in Washington County, Illinois and if birthplace of son Benjamin is correct on this census they were in Illinois by 1835. John and family and a Minor M. Franklin appear side by side on the 1840 Washington County, Illinois census. Minor, aged between 20 and 30, has a wife of the same age and three daughters under age 5 while John is listed with apparent extended family with the following household members:
↑ 3.03.13.2 "United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M854-MGB : 12 April 2016), John Franklin, Washington county, Washington, Illinois, United States; citing family 214, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).
↑ "United States Census, 1840," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XHBV-S8R : 15 August 2017), John Franklin, Washington, Illinois, United States; citing p. 226, NARA microfilm publication M704, (Washington D.C.: National Archives and Records Administration, n.d.), roll 72; FHL microfilm 7,644.
It may be possible to confirm family relationships with John by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree: