| Name | Role | Place | Source | |
|---|---|---|---|---|
| Antonius Jan Grefs | Father | 1751 | Kalmthout | Church records baptisms |
| Jan Batist Grefs | Registered | Roosendaal | Population register | |
| Jan Grefs | Father | 1681 | Amsterdam | Church records baptisms |
| Jan Grefs | Groom | 1794 | Nispen | Church records marriages |
| Jan Grefs | Groom | 1794 | Nispen-Essen | Church records marriages |
| Jan Grefs | Father | 1681 | Amsterdam | Church records baptisms |
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