Daniel was born to a Jewish family in the Latvian town of Aizpute. There, Daniel met and married Bella Hirschorn and together they opened a bakery-grocery in the town. In the 1920s they moved to Liepaja, on the Baltic coast, and opened a dry-goods store. The couple had 10 children, one of whom died in infancy.
1933-39: The Judelowitzes' store sold fabric, accessories and various clothing items from buttons to shirts and stockings. After Daniel and Bella retired, their daughters took over the business. In 1939 Germany invaded Poland. Latvia, at the time, was still a free nation.
1940-41: In June 1941, a year after the Soviets occupied Latvia, German troops entered Liepaja. Like all of Liepaja's Jews, Daniel and his wife were ordered to report to the local police station to register and to turn in their valuables. Within weeks of the occupation, the Germans carried out mass executions on the Baltic coast. These were halted in August. Then between September and December hundreds of Jewish men and women were killed because they were classified as "unfit for work."
In 1941 on Yom Kippur, the Jewish Day of Atonement, Daniel and Bella were arrested and deported. Neither was ever heard from again.