| Name | Role | Place | Source | |
|---|---|---|---|---|
| Jean Guilleaume Antoine Joseph Sybertz | Father | 1812 | Liège | Civil registration births |
| Joseph Sybertz | Witness | 1896 | Brussel | Civil registration marriages |
| Joseph Sybertz | Witness | 1899 | Brussel | Civil registration marriages |
| Joseph Sybertz | Groom | 1899 | Brussel | Civil registration marriages |
| Joseph Sybertz | Witness | 1899 | Brussel | Civil registration marriages |
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