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Cosman Troostwijk, birth 27 MRT 1882 Leeuwarden, Friesland, Nederland, died 24 Sep 1942 Auschwitz, Katowice, Polen, son of Samuel Troostwijk and Doortje Troostwijk
Married 12 Nov 1905 Groningen, Groningen, Nederland to: Leentje Cohen, birth 23 Sep 1881 Groningen, Groningen, Nederland, died 13 MRT 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 OKT 1909 Groningen, Groningen, Nederland |
| 3) Alex Eli Troostwijk, birth 6 Sep 1911 Groningen, Groningen, Nederland, died 2 Apr 1943 Sobibor, Biala Podleska, Polen |