| Name | Role | Place | Source | |
|---|---|---|---|---|
| Jan Herman Groothuis | Registered | 1780 | Amsterdam | Notarial records |
| Jan Herman Groothuis | Witness | 1792 | Amsterdam | Church records baptisms |
| Jan Herman Groothuis | Registered | 1780 | Amsterdam | Notarial records |
| Jan Herman Groothuis | Registered | 1795 | Amsterdam | Notarial records |
| Jan Herman Groothuis | Witness | 1792 | Amsterdam | Church records baptisms |
| Jan Herman Groothuis | Registered | 1796 | Amsterdam | Notarial records |
| Jan Herman Groothuis | Father | 1829 | Bolsward | Civil registration deaths |
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