| 1. Jitske Koster |
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| G: |
25 apr 1886 |
| te: |
Bergum, Tietjerksteradeel |
| O: |
18 feb 1889 |
| te: |
Leeuwarden |
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| 2. Douwe Sybes Koster |
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| G: |
31 jul 1857 |
| te: |
Franeker |
| H: |
31 okt 1885 |
| te: |
Tietjerksteradeel |
| O: |
18 mrt 1926 |
| te: |
Leeuwarden |
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| 4. Sybe Lourens Koster |
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| G: |
9 apr 1815 |
| te: |
Franeker |
| H: |
7 nov 1841 |
| te: |
Franeker |
| O: |
4 mrt 1863 |
| te: |
Franeker |
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| 15. |
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