| Name | Role | Place | Source | |
|---|---|---|---|---|
| Frederik Harm Olthof | Deceased | 1933 | Rotterdam | Civil registration deaths |
| Frederik Harm Olthof | Groom | 1923 | Rotterdam | Civil registration marriages |
| Frederik Harm Olthof | Child | 1897 | Groningen | Civil registration births |
| Frederik Harm Olthof | Deceased | 1933 | Rotterdam | Civil registration deaths |
| Frederik Harm Olthof | Registered | 1880 | Population register | |
| Frederik Harm Olthof | Child | 1895 | Groningen | Civil registration births |
| Frederik Harm Olthof | Deceased | 1895 | Groningen | Civil registration deaths |
| Frederik Harm Olthof | Groom | 1923 | Rotterdam, Groningen | Civil registration marriages |
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