| Name | Role | Place | Source | |
|---|---|---|---|---|
| Frederik Gradus Jan Slijper | Child | 1887 | Rotterdam | Civil registration births |
| Frederik Gradus Jan Slijper | Registered | 1922 | Population register | |
| Frederik Gradus Jan Slijper | Registered | 1930 | Population register | |
| Frederik Gradus Jan Slijper | Child | 1887 | Rotterdam | Civil registration births |
| Frederik Gradus Jan Slijper | Registered | 1880 | Population register | |
| Frederik Gradus Jan Slijper | Groom | 1911 | Rotterdam | Civil registration marriages |
| Frederik Gradus Jan Slijper | Groom | 1911 | Rotterdam | Civil registration marriages |
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