| Name | Role | Place | Source | |
|---|---|---|---|---|
| Harm Hendrik de Groot | Child | 1912 | Oostwold | Civil registration births |
| Harm Hendrik de Groot | Deceased | 1912 | Oostwold | Civil registration deaths |
| Hendrik Harm de Groot | Registered | 1886 | Amsterdam | Population register |
| Hendrik Harm. de Groot | Registered | Castricum | Population register | |
| Hendrik Jan Harm de Groot | Child | 1866 | Heerde | Civil registration births |
| Hendrik Jan Harm de Groot | Deceased | 1866 | Heerde | Civil registration deaths |
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