| Name | Role | Place | Source | |
|---|---|---|---|---|
| Jan Baptist Postels | Groom | 1886 | Brussel | Civil registration marriages |
| Jan Baptist Postels | Witness | 1901 | Ukkel | Civil registration marriages |
| Jan David Postels | Registered | 1787 | Amsterdam | Church records burials |
| Jan Postels | Registered | 1747 | Amsterdam | Notarial records |
| Jan Postels | Registered | 1747 | Amsterdam | Notarial records |
| Jan Postels | Registered | 1739 | Amsterdam | Notarial records |
| Jan Postels | Registered | 1747 | Amsterdam | Notarial records |
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