| Name | Role | Place | Source | |
|---|---|---|---|---|
| Isack Claesz Lefeber | Registered | 1650 | Amsterdam | Notarial records |
| Isack Lefeber | Father | 1725 | Amsterdam | Church records baptisms |
| Isack Lefeber | Buried | 1678 | Middelburg | Church records burials |
| Isack Lefeber | Witness | 1735 | Amsterdam | Church records baptisms |
| Isack Lefeber | Witness | 1735 | Amsterdam | Church records baptisms |
| Isack Lefeber | Father | 1725 | Amsterdam | Church records baptisms |
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