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Benjamin Polak, birth 2 Jan 1850 Bolsward, Friesland, Nederland, son of Isaak|Izak|Izaak|Yzak|Isac Kalmans Polak and Rebekka Nathan de Leeuw
Married 13 Jun 1875 Leeuwarden, Friesland, Nederland to: Henriette Keizer|Keijzer, birth 24 Nov 1842 Leeuwarden, Friesland, Nederland 1st marriage 2nd marriage, daughter of Philip-Feis Nathan Eliazer Keizer|Keijzer and Saartje|Sara Nathans de Leeuw |
| 1) Izaak-Isak Polak, birth 26 Jan 1877 Leeuwarden, Friesland, Nederland, died 29 Sep 1943 Auschwitz, Katowice, Polen |
| 2) Philip Polak, birth 31 Jan 1879 Leeuwarden, Friesland, Nederland |
| 3) Nathan Polak, birth 1 Oct 1880 Leeuwarden, Friesland, Nederland, died 29 Nov 1880 Leeuwarden, Friesland, Nederland |
| 4) Betje Polak, birth 5 Apr 1883 Leeuwarden, Friesland, Nederland, died 4 Jun 1943 Sobibor, Polen |
| 5) Sara Polak, birth 22 Jul 1886 Leeuwarden, Friesland, Nederland, died 17 Mar 1887 Leeuwarden, Friesland, Nederland |