I am not a descendant of this Harris line but other Harris families in the ares. John Fletcher Harris was born c/a 1826 Mecklenburg Co N.C father Henry Harris. The parents of Henry Harris were Solomon Harris and Milly Watkins Harris(proven). Henry Harris was md to Barbara Starnes and had two children Zachariah(b1808) and Eleanor(1805) who married Hugh Baskin McClain. The Rev James McCain is reported to be a brother of Hugh & he was the father of Elizabeth Arbella McCain who md John Fletcher Harris.
Henry Harris had 2 other children Mary C. Harris & John Fletcher Harris 17 years later. No marriage records and it is unknown if he was married 2 times. I have seen reports by others that there is an estate record in Union Co NC (formed from Mecklenburg 1842) that deeds 2 Negro slaves to the daughters in 1848 and mentions both the sons in the estate. He died before 1850 I have not seen this and do not have a copy of it.
Hope this helps.