David Herman Klein and Amalia Jonas married in 1898 in Dordrecht. They had at least two children, among whom Moritz.
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In addition, a Jokos file (number 18848) on this household 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 looted securities or bonds. (W-claim, number C119/1160).