There is a George Dotson in the Barry County Census records this is what I have found.So, he is not the right one.
1870 Flat Creek, Barry, MO Dotson, George 41 IN farmer Rachel J 39 IN James W 19 IN Thomas J 17 IN Mary A 17 IN
1880 Eureka Springs, Carroll, Arkansas Dotson, George 53 IN KY IN carpenter Rachel J 50 IN TN TN James W 29 carpenter IN IN IN
1900 Dist 5, Flat Creek, Barry, MO Dotson, George 72 b. Jan 1828 IN KY KY married 51yrs Rachel J 70 b. Apr 1830 IN TN IN
I still have not located James Dotson wife Nancy and children Rachel, Rohana, and William in an earlier census.
Nor have I found a census record that has a Robert B or Robert Benjamin (Foutch)or any combination of that name in the same town as a Dotson.I have used sounds like and everything that I can think of.They just don't seem to be on a census till 1900 in Talent, Jackson, Oregon!
Luhamie seems to have been too young to have been a Mrs Luhamie Dotson when she married...but I guess that is a possibility.Being a young bride and widow and remarrying soon.
Will keep digging.I have had more than my share of brick walls some I have knocked down and some are still standing.I have been at this since I was a teenager.