After his parents and other family members were killed in the ghetto in 1941, Joseph and his brother David were taken to Sobibor extermination camp.
Potom, čo jeho rodičia a ďalší rodinní príslušníci boli zabití v ghette v roku 1941, bol Jozef a jeho brat David transprotovaní do vyhladzovacieho tábora Sobibor.