| Name | Role | Place | Source | |
|---|---|---|---|---|
| Johan Peter Alt | Father | 1806 | Amsterdam | Church records baptisms |
| Johan Peter Alt | Lidmaat | 's-Gravenhage | DTB Lidmaten | |
| Johan Peter Alt | Lidmaat | 's-Gravenhage | DTB Lidmaten | |
| Johan Peter Alt | Father | 1804 | Amsterdam | Church records baptisms |
| Johan Peter Alt | Father | 1804 | Amsterdam | Church records baptisms |
| Johan Peter Alt | Registered | 1797 | Amsterdam | Notarial records |
| Johan Peter Alt | Registered | 1791 | Amsterdam | Notarial records |
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