I think you can help me with the Johnson family--I have some of Martha's line down to me--but I'm not sure I can be much help to you, as I know nothing about the Rouths.
Here's some info about Martha:
b. March 1, 1796 Second Creek, Mississippi, d. Feb. 9, 1884
m. Nathaniel Wells Pope, MD., son of John Pope (all I know of him is he was b. in England) Feb. 18, 1823 (As a young man, Nathaniel Wells Pope lived in KY--which I guess was VA then--was sort of a frontiersman, and assisted Audubon in the wilds (he's mentioned a number of times in Audubon's abridged journal, Audubon By Himself).)
Anyway, they had 6 children, Caroline Elizabeth (b. 10/20/1823; d. 1866), Florida (b. 6/17/1825), John Johnson (b. 7/16/1826), Nathaniel Greene (b. 10/30/1827), Mary Jane (b. 9/25/1832, Thompson's Creek, LA), Marshall (also an MD, b. 11/26/1833), and Charles William (b. 8/2/1836).
I have some more data, if you'd like it. Or should I email it to you? I'm a newish member of Ancestry.com and don't know how these things are done.