Isidor Polak was the son of Saul Hartog Polak and Sara de Jong. He married in 1910 to Cornelia van Zwanenberg, the daughter of Arnoldus van Zwanenberg and Catharina Levison. Isidor and Cornelia had three children.
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In addition, a Jokos file (number 11275) 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 9442/8755).
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