| Name | Role | Place | Source | |
|---|---|---|---|---|
| Gradus Colbeth | Father | 1839 | Nijmegen | Civil registration deaths |
| Gradus Colbeth | handelt voor zich | 1799 | Schepenprotocollen | |
| Gradus Colbeth | Mention | 1815 | Nijmegen | Notarial records |
| Gradus Colbeth | handelt voor zich | 1799 | Schepenprotocollen |
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