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Benjamin Polak, birth 2 Jan 1850 Bolsward, Friesland, Nederland, son of Isac or Isaak or Izak or Izaak or Yzak 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 Nathan Eliazer Keizer\Keijzer and Saartje or Sara Nathans de Leeuw |
| 1) Izaak 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 |
| 5) Sara Polak, birth 22 Jul 1886 Leeuwarden, Friesland, Nederland, died 17 Mar 1887 Leeuwarden, Friesland, Nederland |