Kaatje and Susanna were sisters from a family of eleven children. Their parents were Benjamin and Sientje Spier . Kaatje was the eldest child. Susanna was the youngest but one.
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Jokos files (numbers 17306, 17311) on this household or other family members are at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.The Jokos files reveal that a claim was lodged for compensation for valuables surrendered to the Lippmann-Rosenthal looting bank (L-claims, numbers 4717/17628, 10056/21056).