| Name | Role | Place | Source | |
|---|---|---|---|---|
| Jan Hermanus Webb Volmer | Father | 1934 | Rotterdam | Civil registration deaths |
| Jan Hermanus Webb Volmer | Registered | 1862 | Hellevoetsluis | Population register |
| Jan Hermanus Webb Volmer | Father | 1934 | Rotterdam | Civil registration deaths |
| Jan Webb | Witness | 1737 | Rotterdam | Church records baptisms |
| Jan Webb | Registered | 1638 | Amsterdam | Notarial records |
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