Joseph Citroen was a son of Cosman Citroen and Rebecca Pool. He married Margaretha Visser in Amsterdam on 18 December 1902, a daughter of Mozes Visser and Esther Hakker. The couple had two children: Estella and Carel. Both the children and their mother have survived the war.
City Archive of Amsterdam, archive card of Joseph Citroen and Margaretha Visser.
Joseph Citroen was the brother of Anna Vos-Citroen and Lea Citroen.
Addition of a visitor of the website.