Hijman Polak was a son of Pinehas Polak and Rozetta van Kreveld. He was married to Roza Beem, daughter of Ezechiel Beem and Sara Cohen.
Hijman Polak and Roza Beem had three unmarried children: Pinéchas, office clerk, Sara, private secretary, and Rozetta Ezie Dina. The family lived in the Bergstraat in Amersfoort. Hijman Polak was a shopkeeper.
A hiding place was found for Rozetta Ezie Dina in D…