Jordans of Elbert & Hart Counties
Well, I have some interesting news for you. First, I will start with the part that is not about (any) Fountain Jordan.
At least according to my own database, the Martha D. Jordan who married Lewis Benjamin Childs was actually the daughter of JOHN Woodson Jordan and Philadelphia Taylor Burden. Since so many of the Jordans still live in Elbert and are intimately familiar with their family, I have simply taken their word for everything. However, John Woodson Jordan is the brother of my own ancestor (James Nelson Jordan); so I have paid particular attention to this family as a whole.
John Woodson Jordan was the son of James Jordan and Obedience White -- definitely NOT a Terrell. There is abundant documentation for all of this; so it is not really in question. James Jordan's parents are not known, and there are a few different theories on who they might be. He is my ancestor, and I have worked a lot on clearing things up. But it is still a somewhat contentious issue and best left for another time.
Obedience White's parents were Luke White and Mary (last name unknown, but widow of Thomas Mewborn) who immigrated to Georgia from Edgecombe County, South Carolina. Luke White's male ancestry seems to be well known for at least a few earlier generations and could probably be found easily online. I have a list of names, but no documentation for the Whites as of yet.
Philadelphia Taylor Burden was the daughter of James Burden and Philadelphia Taylor, whose family I know nothing about. His parents were Archibald Burden and Hannah Goad. To the best of my knowledge, no one really knows the parents of either of them. (Hannah Goad is also my ancestor; so I have looked for more about her, but with no luck.)
Your family seems to have been correct to say that there is no connection between the above Jordans and the Fountain Jordan line. At least there is certainly no CLOSE connection. I suspect that there was some distant kinship, most likely (according to my own personal theory) that James Jordan (husband of Obedience White) was possibly a nephew or grandson of River Jordan (husband of Jane). (My own feeling is that his father was Abner, but others think his parents were John & Rachel.)
In any case, the men I mentioned as possible sons of River & Jane Jordan all lived in very close proximity to one another in Elbert County and often had documented connections, such as witnessing for each other. There is strong evidence of their close ties. I mentioned the reason I believe that James Jordan & Roseanne Terrell were the most likely parents of the younger Fountain. I also think they are probably the grandparents of John Jordan, the man who married Fountain's daughter Harriett.
In an effort to clear up my own Jordans, I tried my best to collect and organize all Jordan families in Elbert, Franklin, Hart, and Madison Counties through the mid-1800s. After looking through all of the Jordans I have (which is almost certainly not everybody), I can only find one John who is the right age and in the right place to marry Harriett. That man was her (possible) first cousin John Jordan, son of John Jordan and Cynthia Wilkey. That possible husband was a few years younger than Harriett, according to earlier census info with thier different families as children, and that fits with later census listings with John and Harriett as a married couple.
Although an older John Jordan was listed nearby in 1880 with a different wife and a little too young to match the man who married Cynthia Wilkey, Cynthia died before the 1870 census. (John was living alone with his son John Jr that year.) John Sr could easily have remarried between 1870 & 1880, and his age may simply have been guessed at by a census taker or family member. (Or he could have shaved off a few years himself to be closer to his new wife.) There is also the very strong possibility that that man is not John Jr's father at all, since John Jr listed his father as being born in Georgia in the 1880 census, while the older John just two doors away lists his birthplace as South Carolina. However, I have learned over the years not to treat such things in the census as the gospel. There seems to have been a lot of guessing involved on the part of census takers back then.
In any case, I believe that the most likely candidate (and really the ONLY candidate that I can find) for the husband of Hariett Jordan was her (probable) first cousin John Jordan, son of John Jordan & Cynthia Wilkey. John Sr. was the son of James Jordan & Roseanne Terrell. I do not know anything about Cynthia Wilkey.
As I mentioned previously, James Jordan seems very likely to have been the son of River & Jane Jordan. Rosanne Terrell was the daughter of Jeremiah Terrell & Luisa Walton. Jeremiah's parents are unknown, but Luisa's were William Walton & Susannah Cobbs.