| Name | Role | Place | Source | |
|---|---|---|---|---|
| Johannes Maria Josef Ritsch | Child | 1901 | Maastricht | Civil registration births |
| Maria Magdalena Ritsch | Mother | 1768 | Coevorden | Church records baptisms |
| Maria Magdalena Ritsch | Mother | 1768 | Coevorden | Church records baptisms |
| Maria Ritsch | Registered | 1770 | Amsterdam | Notarial records |
| Maria Ritsch | Registered | 1770 | Amsterdam | Notarial records |
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