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Isaac Coster, birth 25 Nov 1905 Rotterdam, died 20 Jan 1945 Commando Ohrdruf, son of Louis Coster and Kaatje van Been Rotterdam , Aert van Nesstraat 10a Musicus to: Betje Behr, birth 25 Nov 1908 Groningen, died 11 Feb 1944 Auschwitz, daughter of Izak Behr and Engel Simmeren |
| 1) Izak Louis Coster, birth 13 Dec 1933 Rotterdam, died 11 Feb 1944 Auschwitz |