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| | 1. Robertus Henderikus Kostermans, 26 jan 1891, Assen, NL 7 aug 1950, Groningen, NL ( 59 ) |
| | 2. Margaretha Anna Kostermans, 9 sep 1892, Assen, NL Y |
| | 3. Anna Elisabeth Kostermans, 8 Oct 1893, Assen, NL Y |
| | 4. Henderikus Franciscus Kostermans, 26 mrt 1895, Assen, NL 12 feb 1926, Assen, NL ( 31 ) |
| | 5. Hendri Petrus Kostermans, 28 sep 1896, Assen, NL Y |
| | 6. Franciscus Josephus Kostermans, 14 okt 1900, Assen, NL 24 mrt 1944, Boekel, NL ( 44 ) |
| | 7. Petronella Dorothea Kostermans, 27 okt 1901, Assen, NL Y |
| | 8. Susanna Maria Kostermans, abt Jan 1907, Assen, NL 28 sep 1907, Assen, NL ( ~ 0 ) |
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