All I have on him is speculation also. I do not think he is the son of Joshua Jr., although have not found proof that he is not. I descend through Joseph, and also find it hard to accept that Joseph is a son of Joshua Jr. Why would Joshua Jr. have proven children, and then some who are not? Maybe he moved to another area. If a child of Joshua Jr. born 2 years after Joseph was proven (and Joshua Jr. did not move during this time), and I believe (only from memory) that one daughter was proven one year prior to Joseph's birth, then, why should Joseph be believed as his son? I know and have read the Rev. War Pension of John, Joseph's nephew, who stated he went to SC to visit his Uncle Joseph....but why wasn't Joseph proven as a child of Joshua Jr.? Right now I'm looking for another family as possible ancestors of my Joseph. People back then could have called someone an uncle when they were actually an older cousin or a great uncle.
I have heard speculation that Joseph and Isham might be brothers...or that Joseph may have been married twice. I'd really like to be able to search farther back than I have been able to thus far. If you'd like to talk further contact my email
lands8327@yahoo.com I do get to VA, NC, and SC when I can to research.
There are a couple of Irby researchers who have been at this longer than me. I respect their research very much. This is just a sticking point for me. I also wonder of the relationship of Isham to Joseph.