David Mozes Polak was one of the two sons of Mozes Polak (1867-1930) and Clara Rosenbaum. His father remarried, after becoming a widower, to Sara van Rooijen (Amsterdam, 3 augustus 1874 - Sobibor, 5 maart 1943). David and his parents ran a secondhand shop in the Papenstraat in Deventer. His brother Levi Moses Polak lived in Amsterdam with his family.
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