Kevin, I did receive your August email. I thought I replied, but maybe not. My source for Rowland's children is definitely speculation. Kay Hardiman (Hardison?) from Madison, Alabama told me that Edmund and his brothers are believed to be Rowland's children. She tells me there is a source that shows Rowland was in Madison Alabama sometime in the 1820s. There also must be some proof that all these Whitworth children were born in Madison and that they wre siblings, because everyone seems to accept that as fact. I haven't even seen that source cited anywhere. Maybe it is the Whitworth Bible that has mysteriously disappeared. Kay thought Lu Whitworth had a copy of it, but she says she does not.
Kay and I have wondered if there is a will for Rowland somewhere that would offer us proof. Apparently that will is not in Madison. Some believe that Rowland was living with William Whitworth (Edmund's brother) in the 1840 Davidson County, TN census. There is someone age 80-90 in that household. Personally I think that would make him too old for him to have married Martha Walthall in 1790 unless it was a 2nd marriage.
One or two of the siblings moved from Madison to the southernmost counties of TN (Lawrence, Lincoln, etc.). Rowland potentially could have died there, and so there could be a will in one of those counties. I am not at home right now, but I do have a little more information about where they moved or died I think.
I hope to one day get to the Tennessee State Archives, and back to the Metro Archives to try to find a will. You would think living Nashville, I could get there. As much research as Lu Whitworth has done, you would think she would've stumbled across a will.