Leon Aussen and Roza Kleerekoper were the parents of three children: Catharina, Alfred and Margaretha Bertha. The youngest child was registrated at the Nieuwe Uilenburgerstraat 80.
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Leon Aussen lived first in the same house as the parents of Roza Kleerekoper and after then at the Nieuwe Uilenburgerstraat.
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In addition, a Jokos file (number 50443) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.