| Name | Role | Place | Source | |
|---|---|---|---|---|
| Jacobus Blockland | Father | 1732 | Amsterdam | Church records baptisms |
| Jacobus Wilhelmus van Blockland | Deceased | 1945 | Siegburg | Civil registration deaths |
| Jacobus Wilhelmus van Blockland | Tewerkgestelde | 's-Gravenhage, Abcoude | Workforce registration | |
| Jacobus Wilhelmus van Blockland | Tewerkgestelde | 's-Gravenhage, Abcoude | Workforce registration | |
| Jacobus Wilhelmus van Blockland | Tewerkgestelde | 's-Gravenhage, Abcoude | Workforce registration | |
| Jacobus van Blockland | Father | 1743 | Montfoort | Church records baptisms |
| Jacobus van Blockland | Tewerkgestelde | 's-Gravenhage, Abcoude | Workforce registration | |
| Jacobus van Blockland | Father | 1743 | Montfoort | Church records baptisms |
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