This relationship is revealed in Swamp Thing (fourth series) #9 (2005), the first issue in the series to be written by Joshua Dysart.
Joshua Reynolds | Joshua Bell | Joshua | Joshua Nkomo | Joshua James | The Joshua Tree | Joshua Bates | Abraham Joshua Heschel | Joshua Tree National Park | Lionel Tollemache, 8th Earl of Dysart | Joshua the High Priest | Joshua Jebb | Joshua ben Levi | Earl of Dysart | Joshua Then and Now | Joshua Logan | Joshua Jay | Joshua Fisher | Joshua Eagle | Joshua Tree | Joshua Topolsky | Joshua Sobol | Joshua Mowll | Joshua Kennedy | Joshua Hassan | Sir Joshua Rowley, 1st Baronet | Joshua Slocum | Joshua Schachter | Joshua Rifkin | Joshua M. Epstein |