Children |
| 1. Robertus Henderikus Kostermans, b. Mon 26 Jan 1891, Assen, Drenthe, Nederland |
| 2. Margaretha Anna Kostermans, b. Fri 09 Sep 1892, Assen, Drenthe, Nederland |
| 3. Anna Elisabeth Kostermans, b. Sun 08 Oct 1893, Assen, Drenthe, Nederland |
| 4. Henderikus Franciscus Kostermans, b. Tue 26 Mar 1895, Assen, Drenthe, Nederland |
| 5. Hendri Petrus Kostermans, b. Mon 28 Sep 1896, Assen, Drenthe, Nederland |
| 6. Franciscus Josephus Kostermans, b. Sun 14 Oct 1900, Assen, Drenthe, Nederland |
| 7. Petronella Dorothea Kostermans, b. Sun 27 Oct 1901, Assen, Drenthe, Nederland |
| 8. Susanna Maria Kostermans, b. Jan 1907, Assen, Drenthe, Nederland |
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