| Name | Role | Place | Source | |
|---|---|---|---|---|
| Achille Charles Louis Decooman | Groom | 1890 | Sint-Gillis | Civil registration marriages |
| Charles Louis Decooman | Witness | 1846 | Vollezele | Civil registration marriages |
| Louis Decooman | Witness | 1879 | Sint-Joost-ten-Node | Civil registration marriages |
| Louis Decooman | Witness | 1901 | Heikruis | Civil registration marriages |
| Louis Decooman | Witness | 1908 | Brussel | Civil registration marriages |
| Louis Decooman | Witness | 1907 | Herfelingen | Civil registration marriages |
| Louis Decooman | Witness | 1906 | Tollembeek | Civil registration marriages |
| Octave Louis Decooman | Child | 1871 | Halle | Civil registration births |
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