Joël Bartels was a son of Emanuel Bartels and Roosje Komkommer. He was married on 5 November 1916 in Amsterdam to Saartje Cohen and together they had a daughter Betsy in 1917. Saartje Cohen passed away however on 5 February 1932 and Joel remarried on 11 June 1941 in Amsterdam to Saartje's sister Jet…
In addition, a Jokos file (number 55940) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.