Mozes de Groot was a son of Israel de Groot and Grietje Hilversum. He was born on 20 June 1903 in Amersfoort. On 3 June 1927 he married in Enschede Julia Schaap, woh was born in Hilversum on 23 March 1906 as a daughter of Hartog Schaap and Johanna Gobas. From this marriage, two children were born, namely Lezer on 3 March 1928 in Amersfoort and on 29 April 1929 Israel followed in Zeist.
The marriage of Mozes and Julia did not last and on 30 August 1932 their marriage was dissolved by divorce. Israel remained with his mother and Lezer stayed living with his father. Mozes remarried then on 2 August 1933 in Utrecht Parle Blitz, who was born on 12 April 1904 in Amsterdam as a daughter of Abraham Blitz and Henriëtte de Hond. From this marriage, another son Abraham was born on 27 January 1937 in Amersfoort.
Mozes de Groot was a dealer in second-hand merchandise and because of his trade he stayed regularly in other cities like Enschede, Den Bosch, Utrecht and in Amersfoort. After his wedding to Parle Blitz in Utrecht, Mozes lived there with his son Lezer and his newly wed wife Parle there at Ternatestraat 6-bis-A but on 17 March 1939 they moved to Blasiusstraat 100 2nd floor in Amsterdam.
After being arrested in the summer of 1942 in Amsterdam, Mozes, his wife Parle and the children Lezer and Abraham de Groot were registered in Westerbork on 6 September 1942 but already the next day, on 7 September deported to Auschwitz. The 14-year old Lezer, his 5-year old half-brother Abraham, together with their 38-year old stepmother/mother Parle Blitz were immediately killed upon arrival on 10 September 1942 in the gas chambers of Auschwitz-Birkenau.
However, during a stopover of the transport in Kozel, located ±80 km west from Auschwitz, Mozes de Groot and another 109 deportees were forced to leave the train. They were deployed as forced labourers in the surrounding labour camps in that region of Auschwitz. But they, who remained in the train were transported onwards to Auschwitz to be killed there.
Mozes de Groot ended up in the labour camp Seibersdorf, located in the southern part of Poland near the Czech border. The circumstances there were inhumane and Mozes de Groot – just as so many others – has lost his life there at some point. It is not known under what circumstances nor the exact date of his death. Therefore the Dutch Ministry of Justice after the war commissioned the Municipality of Amsterdam to draw up a certificate of death for Mozes de Groot, in which is established that he has died in Seibersdorf on 31 March 1943.
Sources include the City Archive of Amsterdam, family registration card of Mozes de Groot; archive cards of Mozes de Groot, Julia Schaap, Parle Blitz, Lezer and Abraham de Groot; the file cabinet of the Jewish Council, registration cards of Mozes de Groot, Parle de Groot-Blitz, Lezer de Groot en Abraham de Groot; certificate of death for Mozes de Groot dated 6 December 1951, nr. 27 from the A-register-folio 6 and the Wikipedia listing of jodentransporten vanuit Nederland.nl