Zacharias Blog married three times. His last marriage was with Clara Wertheim. The couple had four children. During the war, Clara Wertheim was hospitalised at the psychiatric institution 'Apeldoornse Bos'.
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The youngest daughter of this family, Wilhelmina, resided at the Centraal Israëlitisch Wees- en Doorgangshuis in Leiden. Wilhelmina died during the war.
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In addition, a Jokos file (number 8937) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.The Jokos file reveals that a claim was lodged for compensation for valuables surrendered to the Lippmann-Rosenthal looting bank (L-claim, number 10849 / 9125).