Jacob Hartz was a son of Isaac Hartz and Esther Nunes Vaz, who both have survived the Holocaust. Municipal Archive of Amsterdam, archive cards of Isaac Hartz and Esther Nunes Vaz.
We have been unable to determine whether one or more members of this family survived the war. While their names do not appear on the lists of survivors, we have not been able to trace them in In Memoriam either. They are therefore labeled as 'surviving' and their names are not listed.