| Name | Role | Place | Source | |
|---|---|---|---|---|
| Gustave Gaston Mercy | Deceased | 1971 | Mangiennes | Civil registration deaths |
| Gustave Gaston Mercy | Deceased | 1971 | Mangiennes | Civil registration deaths |
| Gustave Mercy | Witness | 1904 | Sint-Jans-Molenbeek | Civil registration marriages |
| Gustave Mercy | Witness | 1876 | Brussel | Civil registration marriages |
| Gustave Mercy | Groom | 1903 | Sint-Jans-Molenbeek | Civil registration marriages |
| Gustave Mercy | Groom | 1903 | Sint-Jans-Molenbeek | Civil registration marriages |
| Gustave Mercy | Previous partner bride | 1910 | Sint-Jans-Molenbeek | Civil registration marriages |
| Gustave Mercy | Witness | 1903 | Sint-Jans-Molenbeek | Civil registration marriages |
| Gustave Mercy | Witness | 1901 | Sint-Jans-Molenbeek | Civil registration marriages |
| Louis Palamède Gustave Humbert de Mercy | Father of bride | 1911 | Brussel | Civil registration marriages |
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