Here's the information on George from the 1860 Ripley Co., MO census
1860 Federal Census, Current River Township, Ripley County, Missouri Enumerated 17 August 1860 by Jas S Rawlins pg 53 347/337 GARTON, G. G. 38 M FarmerTN M.M.28 F Domestic TN S. E. 15 F TN H.A. 12 M TN T. J. 10 M MO CASH, J.E. 6 F MO
It looks like he had at least two wives- Eliza Byrd and M. M. (is this your Mary Martin?--what would her middle name have been?)M. M. is too young to be the mother of Sarah Ellen.