Isbert Isaak Greilsheimer was a son of Julius Greilsheimer and Karolina Schlessinger.
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Isbert Isaak Greilsheimer died on 15 July 1943 in Westerbork transit camp and he was cremated on 16 July 1943. The urn with his ashes was placed on the Jewish cemetry in Diemen on field U, row 10, grave nr. 12.
Register van joden die in het kamp Westerbork zijn gecremeerd, 1943-1944; archief van de gemeente Westerbork, opgenomen in het archief van de gemeente Midden-Drenthe te Beilen, inv. n 3789