Rosa Lijdesdorff was a daughter of Meijer Lijdesdorff and Lena Lopes Dias. In July of 1942, she married Marcus Keizer, in Harlingen.
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According to the Sterbebücher of Auschwitz Rosa Lijdesdorff died on 1 December 1942. It is possible this date is different from the official day of death as established after the war by the Department of Justice.