Clara Ossendrijver was a daughter of Samuel Ossendrijver and Sara Zwart. She married 18 January 1939 in Amsterdam to Meijer van Cleef, a son of Emanuel van Cleef and Hadassa Wolff. In 1942, their daughter Hadassa was born.
Her siblings Jacob and Abraham have been killed during the Holocaust too.
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In addition, a Jokos file (number 3902) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.