Thanks for the additional information:
John W. Cox, b. 1826 in NC - Co. B, 5th GA
His brothers are:
James Monroe Cox, b. 1829 Co. G, 18th GA
William T., b. 1837, Co. H, 18th GA
I would suspect that the Monroe Cox in Co. H may well be James M. Cox?
Also they had an Uncle named George, b. 1775 NC
the George W. Cox may well be a cousin?
John W. Cox had two sisters we know of:
Martha, b. 1832, and
Sara, b. 1840
All living in Cass Co. GA in 1850
Thanks again, Susan and Rob Cox