Regarding your message about the children of William Isbell and Anne Dillard and where the information came from - the birth dates for William and Anne's children, from Christopher Isbell through Mary Isbell, come from the "Douglas Register", a record of births, marriages and deaths kept by Rev. William Douglas of Goochland County, VA. The names of all the children of William and Anne Dillard Isbell are also listed in the Mayo Bible, Book of Common Prayer which can be found in "Kentucky Bible Records, Volume I". The birth date of the eldest son, George, is from a record that was given to me by another researcher who found it among her father's papers. He had copied the record that listed dates for George, his wife, and children from a Bible, but neglected to note whose Bible, when and where it was published or who owned it.
The elder children of William and Anne Isbell were probably born in Orange County, VA, not Goochland County. There is no proof that William was a son of Henry Isbell, just circumstantial evidence. We do not know that Henry Isbell's wife was named Hannah - just that he was probably married to a daughter of James Cox. Also, Henry was in all likelihood born in King William County, VA. He was in Caroline County, VA by 1727 and later in Orange County, VA.