Jacob Frank and Maria Louise Frank got married in Rotterdam on 24 August 1893. In 1940 they had six living children. Four of them survived the war.
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Jacob and Maria Louise Frank were the parents of Mozes (Maurits).
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In addition, a Jokos file (number 6357) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.