Aäron Neuburger was a widower. His wife, Betje Pool (b. 1875), had died in 1938. She is buried in Muiderberg. Aäron and Betje had four children, three of whom survived the war. Their son Mozes Neuburger was killed, along with his wife and two young daughters. As a young man, Aäron is said to have studied at the Nederlands Israelitisch Seminarium, but family life and the rising socialist movement t…