| Name | Role | Place | Source | |
|---|---|---|---|---|
| Gustave August Mercelis | Groom | 1851 | Sint-Joost-ten-Node | Civil registration marriages |
| Gustave Auguste Mercelis | Witness | 1867 | Brussel | Civil registration marriages |
| Gustave Auguste Mercelis | Witness | 1848 | Sint-Joost-ten-Node | Civil registration marriages |
| Gustave Mercelis | Witness | 1874 | Elsene | Civil registration marriages |
| Gustave Mercelis | Witness | 1853 | Brussel | Civil registration marriages |
| Gustave Mercelis | Witness | 1873 | Brussel | Civil registration marriages |
| Gustave Mercelis | Witness | 1910 | Brussel | Civil registration marriages |
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