| Name | Role | Place | Source | |
|---|---|---|---|---|
| Jan Pieter Mathijs Keybets | Genoemde | 1883 | Heerlen | Notarial records |
| Jan Pieter Mathijs Keybets | Genoemde | 1883 | Heerlen | Notarial records |
| Mathijs Alexander Hubert Keybets | Deceased | 1937 | Ubach over Worms | Civil registration deaths |
| Mathijs Joseph Keybets | Father | 1883 | Kerkrade | Civil registration deaths |
| Mathijs Keybets | Witness | 1899 | Kerkrade | Civil registration deaths |
| Mathijs Keybets | Witness | 1899 | Kerkrade | Civil registration deaths |
| Pieter Mathijs Keybets | Partij | 1866 | Heerlen | Notarial records |
| Pieter Mathijs Keybets | Partij | 1866 | Heerlen | Notarial records |
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