Jacob Slösser was a son of Isaak Slösser and Roosje Frankvoorder. He was born on 8 May 1903 in Amsterdam and trader in tropical fruits. On 22 January 1931 he married Vrouwtje Bierman in Amsterdam, a daughter of Mozes Bierman and Rosalie de Leeuwe. Vrouwtje Bierman was born on 31 January 1911 in Amst…