| Name | Role | Place | Source | |
|---|---|---|---|---|
| Jan Josef Decoster | Child | 1882 | Opvelp | Civil registration births |
| Jan Josef Decoster | Child | 1888 | Roosbeek | Civil registration births |
| Josef Decoster | Child | 1899 | Sint-Joris-Weert | Civil registration births |
| Josef Decoster | Witness | 1886 | Zaventem | Civil registration births |
| Josef Decoster | Father of groom | 1901 | Roosbeek | Civil registration marriages |
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