One researcher suggests his father may have been Nathan or Nathaniel. He lived in Washington Co and Benton Co. AR 1830 to 1857 then CA. Other names that may be related are Henry, Thomas, Joseph or Josephile, Commodore. A nephew signed his name to a letter "T.J. Abbott" and directed mail to Cincinati; someone lived in Napoleon and in Pocahontas.About 1831, Joshua married Elizabeth Ann Matthews Epperson, widow of Joel Ep.She had three sons, Wm Harrison, Robert Lee, and Jahiel.Joshua's children were Richardson, Catherine, Daniel, Eliza Adeline and Melissa. They may have associated with Alexander/Lucinda StClair or Sinclair.Thanks for any help.