could be the James Ewell (16) in 1860 census living, along with Fanny Ewell, age 30, hired secretary?, in the household of John (52) and Catherine (24) Henderson

or could be the James Ewell in
1860 Acc. census:
Household of William (32) and Jane (35) Marshall
JS Taylor
Frank Ewell 16 (B)
James Ewell 13 (B)

or could be totally different person