Jakob Polak from Wildervank was a son of Nathan Isaak Polak and Rachel Cohen. He married 14 March 1928 in Rotterdam Henriette Helena Polak, a daughter of Michel Polak and Klaartje van Gelder. As far as known, this couple had no children.
Since 26 March 1930, his unmarried sister Betje lived in with Jakob and his wife Henriette, first at Virulyplain 3b and per 26 March 1938 at Doezastraat 32 b in…