| 1. Rein Koelstra |
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| B: |
9 Nov 1915 |
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Balk, Friesland, Netherlands |
| D: |
9 Jun 1990 |
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Veenendaal, Utrecht, Netherlands |
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| 2. Jan Koelstra |
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| B: |
22 Oct 1885 |
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Molkwerum, Friesland, Netherlands |
| M: |
8 Mar 1913 |
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Gaasterland, Friesland, Netherlands |
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| 3. Wiepkje Kool |
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| B: |
15 Mar 1887 |
| P: |
Oudega, Smallingerland, Friesland, Netherlands |
| D: |
1952 |
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| 6. Rein Berends Kool |
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| B: |
19 May 1855 |
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Hemelumer Oldeferd, Friesland, Netherlands |
| M: |
9 Dec 1880 |
| P: |
Hemelumer Oldeferd, Friesland, Netherlands |
| D: |
2 Feb 1917 |
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Sneek, Friesland, Netherlands |
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| 7. Minke Robijns Feenstra |
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| B: |
22 Feb 1852 |
| P: |
Gaasterland, Friesland, Netherlands |
| D: |
27 Feb 1909 |
| P: |
Hemelumer Oldeferd, Friesland, Netherlands |
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| 14. Robijn Wybes Feenstra |
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| B: |
5 Sep 1821 |
| P: |
Wijckel, Friesland, Netherlands |
| M: |
12 May 1847 |
| P: |
Gaasterland, Friesland, Netherlands |
| D: |
19 May 1909 |
| P: |
Molkwerum, Friesland, Netherlands |
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| 15. Symentje Johannes WIERSTRA |
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| B: |
2 Jul 1826 |
| P: |
Nijemirdum, Friesland, Netherlands |
| D: |
13 Feb 1869 |
| P: |
Doniawerstal, Friesland, Netherlands |
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1915 - 1990 (74 years)