I added Jane Stewart (nee Jefferson)'s dates of birth and death based on her headstone in Mercerville Cemetery in Gallia, Co, Ohio which stated:
Jane Stewart w/o Jesse
died 2/10/1850 58y 1m 4d
both buried in the Mercerville Cemetery, Guyan Township, Gallia Co., OH, graves next to each other. Copies of photos furnished to me by Kathy Anderson. Ohio Cemetery records verify.
Kathy A. sent me xeroxes of her photographs of the headstones (she didn't remember to take a digital camera on her trip.) So they won't be of much help. Before the end of the summer, I hope to get out to Gallia Co. to photograph them myself before they completely disintigrate. They are tilted and in rough shape.