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 Amsterdam and she worked as a seamstress.
After their weddingday, Jacob Slösser and Vrouwtje Bierman lived at Amstel 143, moved to Hofmeijerstraat 2 on 6 March 1935 and on 11 March 1936, their address was Vechtstraat 148. They had two children together, namely Isaak, born on 10 June 1931 and on 18 August 1934, Mozes. The marriage however did not last and on 20 July 1937 the marriage was dissolved by divorce. On 1 March 1939 Vrouwtje Bierman remarried then Josef Karl Goedhardt.
After the divorce, the two children Isaak and Mozes remained living with their father Jacob Slösser who after a few months remarried on 14 October 1938 Gracia Sealtiel, a daughter of Meijer Sealtiel and Susanna Sealtiel. She was born on 22 March 1916 in Amsterdam.
From the marriage of Jacob and Gracia two more children were born, namely Roosje on 21 March 1939 and Susanna on 25 December 1940. After their weddingday they went living at Amstellaan 59 in the River district of Amsterdam, then on 4 March 1939 they moved to Uiterwaardenstraat 42 1st floor and on 11 March 1940 they moved to Hoendiepstraat 18 1st floor.
The entire Slösser family, with Jacob Slösser, his wife Gracis Sealtiel and the four children Isaak, Mozes, Roosje and Susanna, were carried off to concentration camp Vught in the night of 10 to 11 June 1943. Also in the night of 2 to 3 July they were sent from Vught to Westerbork where they have been locked up in the penal barrack 67, (for reasons unknown). On 13 July 1943 the complete family was put on transport to the East and on arrival on 16 July 1943 in Sobibor, they were all immediately murdered in the gas chambers there.
Sources include the City Archive of Amsterdam, family registration card of Jacob Slösser, archive cards of Jacob Slösser, Vrouwtje Bierman and Gracia Sealtiel; residence cards of Amsterdam, De la Reystraat 14 and Ruyschstraat 29; website ITS Arolson, camp cards Vught for the Slösser family; the file cabinet of the Jewish Council, registration cards of Jacob Slösser, Gracia Slösser-Sealtiel and the children Isaak, Mozes, Roosje and Susanna Slösser and the transport list of 13 July 1943 as published in the book Extermination camp Sobibor by Jules Schelvis.