For starters, is this him in 1860?
1860 United States Federal Census
Name: John R Hart
Age: 39
Birth Year: abt 1821
Gender: Male
Birth Place: North Carolina
Home in 1860: North Carolina, Floyd, Georgia
Post Office: Coosaville
Household Members:
Name Age
John R Hart 39 Farmer
Agnes P Hart 26 Domestic
Verginia g H Hart 10
Rebecca N Hart 7