| Name | Role | Place | Source | |
|---|---|---|---|---|
| Adriaantje jan Degroot | Registered | 's-Hertogenbosch | Gevangenisregister | |
| Gerard Jan Antoon deGroot | Registered | Antwerpen | Foreigners register | |
| Jan Baptist Degroot | Witness | 1900 | Brussel | Civil registration marriages |
| Jan Baptist Degroot | Witness | 1897 | Brussel | Civil registration marriages |
| Jan Conrard Degroot | Partner | 1861 | Helden | Civil registration deaths |
| Jan Degroot | Registered | Maastricht | Population register | |
| Jan Theodoor DeGroot | Groom | 1891 | Lommel | Civil registration marriages |
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