| Name | Role | Place | Source | |
|---|---|---|---|---|
| Mathieu Megnard Sidérius | Father | 1904 | Ciney | Civil registration deaths |
| Mathieu Menard Siderius | Partner | 1878 | Mons | Civil registration deaths |
| Mathieu Menard Siderius | Father | 1893 | Mons | Civil registration deaths |
| Mathieu Meynard Siderius | Father | 1827 | Namur | Church records baptisms |
| Mathieu Meynard Siderius | Father | 1827 | Namur | Church records baptisms |
| Mathieu Meynard Siderius | Father | 1827 | Namur | Church records baptisms |
| Mathieu Siderius | Father of bride | 1871 | Elsene | Civil registration marriages |
| Mathieu Siderius | Father | 1883 | Mons | Civil registration deaths |
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