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| Jonas Barend Hakker, birth 2 Feb 1882 Den Haag, died 26 Mar 1943 Sobibor living Amsterdam, occupation: sigarmaker, marketmerchant, son of Barend Jacob Hakker and Betje Moses Keijl Married 24 Dec 1908 Amsterdam to: Saartje Mozes Meents, birth 20 May 1879 Amsterdam, died 26 Mar 1943 Sobibor living Amsterdam, daughter of Moses David Meents and Roosje Lap | 
| 1) Betje Jonas Hakker, birth 18 Oct 1909 Amsterdam, died 2 Jul 1943 Sobibor living Amsterdam
 to: Emanuel Mordechai Morpurgo, birth 12 Sep 1907 Amsterdam, died 2 Jul 1943 Sobibor living Amsterdam, occupation: merchant of drapery, merchant on a market, son of Mordechai Morpurgo and Klaartje Sitters | 
| 2) Sophia Jonas Hakker, birth 5 Mar 1915 Amsterdam, died 6 Oct 1978 Amsterdam, buried Amsterdam on graveyard "Nieuwe Oosterbegraafplaats", occupation: handworker (divorced) to: Mauritz Alexander Wessels PRIVACY FILTER, son of Jozef Wessels and Bertha Marianne Dribbel | 
| 3) Greta Jonas Hakker, birth 7 Dec 1916 Amsterdam, died after 2003, occupation: seamstress Married (church) 1 Apr 1942 Amsterdam to: Alfred (Fred) van IJssel, birth 9 Jul 1917 Den Haag, died 30 Apr 1978 Den Haag, buried Hoofddorp on "Gan Hashalom", son of Jacob van IJssel and Sipora Logher | 
| 4) Bernardus Jonas Hakker, birth 28 Nov 1918 Amsterdam, died 30 Apr 1943 Auschwitz
 to: Esther Salomon Zwart, birth 18 Mar 1917 Amsterdam, died 19 Feb 1943 Auschwitz, daughter of Salomon Zwart and Marianne de Jong | 
| 5) Maurits Jonas Hakker, birth 16 Nov 1922 Amsterdam, died 30 Sep 1942 Auschwitz | 
| 6) Jacques Jonas Hakker, birth 16 Mar 1924 Amsterdam, died 30 Sep 1942 Auschwitz, occupation: factory-worker |