| Name | Role | Place | Source | |
|---|---|---|---|---|
| Gustave Proost | Father of groom | 1911 | Brussel | Civil registration marriages |
| Gustave Proost | Groom | 1880 | Sint-Jans-Molenbeek | Civil registration marriages |
| Gustave Proost | Father of groom | 1910 | Laken | Civil registration marriages |
| Gustave Proost | Witness | 1877 | Sint-Joost-ten-Node | Civil registration marriages |
| Gustave Proost | Witness | 1879 | Schaarbeek | Civil registration marriages |
| Hortense Gustave De Proost | Mother | 1903 | Gent | Civil registration births |
| Jean Charles Gustave Proost | Groom | 1911 | Brussel | Civil registration marriages |
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