Is your Cone family related to the famous capt William Cone (Revolutionary War Era, Indian Fighter)
I have an ancestor from Thomasville Georgia named Tabitha Cone (Race: Mulatto) born 1810 in North Carolina, her Son was Ephrim Cone (Race: Mulatto) Born 1835 in South Carolina.
All three locations of birth and residents are places were Joseph Cone , William Cone or other Cone descendants had plantations.
Does any of your records suggest capture of Indian slaves ?
Is any member of your Cone line mulatto or believed to be mixed race American Indian ?