Juda Polak was a son of Isaac Polak and Sara Loonstijn. He married in Amsterdam on 24 October 1906 to Grietje Verduin, daughter of Levie Abraham Verduin and Vrouwtje Philip Rood. Besides Grietje, there were also her brothers Isaac, Barend and Jacob Verduin.
Juda and Grietje had one daughter Sara, …