I, too, believe that Nimrod and Hiram were brothers but cannot prove it. My GGgrandmother was Margaret Floyd who was born about 1803 in Tennessee according to the 1850 census. She married John Thomas and lived in McMinn County, Tennessee.I have not been able to find her parents but have found her living near Hiram and Nimrod. The family story is that she had 2 brothers in East Tennessee. Recently, I had a distant cousin DNA match on Ancestry.com to a person who is a descendant of Nimrod Floyd. To me this match somewhat validates my belief that Nimrod, Hiram, and Margaret are related. Just wish we could find who their parents were!