I feel certain this John Stancil is the son of John Stancil Jr. who died circa 1816 in Johnston Co., NC.
This John born circa 1796 and was listed as 83 years old on the 1880 census. His estate record dated 1886 provides the following information which may be interesting for some. It may also help clear up some erroneous info that I have seen posted about some of these people.
John's children per 1886 estate file: Sons-Reddic, Larkin,John Chrisopher Daughters: Martha Mary wife of Robinson Stancil (son of Winchester) Margaret(Peggy) wife of Mabry Garner Elizabeth wife of Elias Stancil(s/o Wm and Milly Stancil) Laura wife of Wesly Raper Zilphia Kenyon
Grandchildren: Joseph Kenyon s/o daughter Zilphia Gaston W. s/o Wm Stancil Charlie Lloyd & George W. Stancil sons of John Christopher