| Name | Role | Place | Source | |
|---|---|---|---|---|
| Koert Grutter | Father | 1891 | Aduard | Civil registration births |
| Koert Grutter | Child | 1859 | Midwolde | Civil registration births |
| Koert Grutter | Deceased | 1922 | Enumatil | Civil registration deaths |
| Koert Grutter | Relation | 1919 | Hoogkerk | Civil registration deaths |
| Koert Grutter | Father of bride | 1914 | Aduard | Civil registration marriages |
| Koert Grutter | Groom | 1891 | Grootegast | Civil registration marriages |
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