| Name | Role | Place | Source | |
|---|---|---|---|---|
| Ysak van Leeuwen | Father | 1744 | Rotterdam | Church records baptisms |
| Ysak van Leeuwen | Registered | 1699 | Amsterdam | Notarial records |
| Ysak van Leeuwen | Child | 1733 | Sassenheim | |
| Ysak van Leeuwen | Father | 1696 | Leiden | |
| Ysak van Leeuwen | Child | 1742 | Sassenheim | |
| Ysak van Leeuwen | Child | 1717 | Sassenheim | |
| Ysak van Leeuwen | Child | 1717 | Sassenheim |
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