Joseph Gosler married on 25th June 1902 in Amsterdam to Judikje van Hasselt. They had six children: Isaac, Maria, Sara and three children who survived the war.
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In addition, Jokos files (numbers 18045, 16818) on this family or other family members are at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.