| Name | Role | Place | Source | |
|---|---|---|---|---|
| Ype Simons de Groot | Seller | 1823 | Harlingen | Notarial records |
| Ype Simons de Groot | Seller | 1826 | Harlingen | Notarial records |
| Ype Simons de Groot | Registered | 1811 | Harlingen | Name adoption |
| Ype Simons de Groot | Deceased | 1826 | Harlingen | Death duties files |
| Ype Simons de Groot | Creditor | 1813 | Harlingen | Notarial records |
| Ype Simons de Groot | Mention | 1871 | Haskerland | Kohieren hoofdelijke omslag |
| Ype Simons de Groot | Father | 1862 | Joure | Civil registration deaths |
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