| Name | Role | Place | Source | |
|---|---|---|---|---|
| Gradus Koopmann | Baptized | 1809 | Bodegraven | Church records baptisms |
| Gradus Koopmann | Groom | 1831 | Bodegraven | Civil registration marriages |
| Gradus Koopmann | Father | 1833 | Bodegraven | Civil registration births |
| Gradus Koopmann | Father | 1832 | Bodegraven | Civil registration births |
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