| 1. Geert Ritsema |
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| G: |
10 feb 1897 |
| te: |
Thesinge , Ten Boer, Groningen |
| O: |
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| te: |
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| 2. Fridus Ritsema |
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| G: |
6 nov 1848 |
| te: |
Thesinge , Ten Boer, Groningen |
| H: |
7 mrt 1889 |
| te: |
Ten Boer |
| O: |
16 jul 1915 |
| te: |
Thesinge , Ten Boer, Groningen |
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| 4. Gerard Friedus Ritsema |
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| G: |
24 jan 1820 |
| te: |
Ten Boer |
| H: |
8 aug 1846 |
| te: |
Ten Boer |
| O: |
29 jun 1858 |
| te: |
Gammerwolde, Ten Boer, Groningen |
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| 16. |
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