| Name | Role | Place | Source | |
|---|---|---|---|---|
| Gijsbertus Antonius Marie van Helvert | Child | 1884 | Oosterhout | Civil registration births |
| Gijsbertus Antonius Marie van Helvert | Registered | 's-Gravenhage | Studbooks | |
| Gijsbertus Antonius Marie van Helvert | Registered | 1884 | Oosterhout | Population register |
| Gijsbertus Antonius Marie van Helvert | Registered | Leiden, Oosterhout | ||
| Gijsbertus Antonius Marie van Helvert | Child | 1884 | Oosterhout | Civil registration births |
| Gijsbertus Antonius Marie van Helvert | Loteling | 1904 | Leiden, Oosterhout | |
| Gijsbertus Antonius Marie van Helvert | Registered | Leiden, Oosterhout | ||
| Gijsbertus Antonius van Helvert | Registered | 1884 | Oosterhout | Population register |
| Hendricus Antonius Gijsbertus van Helvert | Registered | Amsterdam | Militia records | |
| Hendricus Antonius Gijsbertus van Helvert | Groom | 1921 | Amsterdam | Civil registration marriages |
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