| Name | Role | Place | Source | |
|---|---|---|---|---|
| Dirk Jan Velthuis | Person in notarial deed | 1918 | Obdam | Notarial records |
| Dirk Jan Velthuis | Person in notarial deed | 1911 | Obdam | Notarial records |
| Dirk Jan Velthuis | Person in notarial deed | 1919 | Obdam | Notarial records |
| Dirk Jan Velthuis | Registered | 1906 | Alkmaar | Notarial records |
| Dirk Jan Velthuis | Registered | 1919 | Alkmaar | Notarial records |
| Dirk Jan Velthuis | Registered | 1910 | Alkmaar | Notarial records |
| Dirk Jan Velthuis | Registered | 1923 | Alkmaar | Notarial records |
| Dirk Jan Velthuis | Father | 1854 | Avereest | Civil registration births |
| Dirk Jan Velthuis | Registered | 1920 | Alkmaar | Notarial records |
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