Aaltje de Schaap was a daughter of Heiman de Schaap and Dina Wijnberg. She married Mozes Roeper in 1906 in Weesp. They had five children: Elias, Heiman Salomon, the here mentioned Abraham and two children who survived the war.
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In addition, a Jokos file (number 10492) on this household is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.