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Izaak Simon Bollegraf, birth 22 Apr 1879 Groningen, Groningen, Nederland, son of Simon Izaak Bollegraf and Hester de Beer\Behr
Married 3 Nov 1901 Groningen, Groningen, Nederland to: Sophia van Gelder, birth 31 Dec 1870 Groningen, Groningen, Nederland, daughter of Samuel Lazarus van Gelder and Hinderkien de Groot |
| 1) Simon Bollegraf, birth 6 Sep 1902 Groningen, Groningen, Nederland |