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Cosman Troostwijk, birth 27 Mar 1882 Leeuwarden, Friesland, Nederland, died 24 Sep 1942 Auschwitz, Katowice, Polen
Married 12 Nov 1905 Groningen, Groningen, Nederland to: Leentje Cohen, birth 23 Sep 1881 Groningen, Groningen, Nederland, died 13 Mar 1943 Sobibor, Biala Podleska, Polen, daughter of Elias Izak Cohen and Naatje Bernard |
| 1) Philippus Troostwijk, birth 6 Dec 1907 Groningen, Groningen, Nederland |
| 2) Dora Troostwijk, birth 28 Jul 1909 Groningen, Groningen, Nederland, died 7 Oct 1909 Groningen, Groningen, Nederland |
| 3) Alex Eli Troostwijk, birth 6 Sep 1911 Groningen, Groningen, Nederland, died 2 Apr 1943 Sobibor, Biala Podleska, Polen |