Josua (Jozua) Blom was a son of the 1st marriage of Marcus Jacob Blom and Rozette de Vries. On 19 November 1900 he married in Amsterdam his cousin (1st degree) Rebecca Blom, a daughter of Machiel Blom and Bertina van Gelderen. The couple had two children, Rozette and Bertina.
The eldest daughter o…