Salomon Hakker and Grietje Porets had four children. Two of them survived the war. The other two were Marie and Ester.
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In addition, a Jokos file (number 9347) 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 4644/13103).