| Male Willem I van Béthune |
| Birth | ||
| Death | ||
| Burial | ||
| Marriage | ||
| Father | Robert IV van Béthune | F2047 Group Sheet | |
| Mother | Alix van Péronne | F2047 Group Sheet | |
| Female Clementia van Oisy |
| Birth | ||
| Death | ||
| Burial | ||
| Father | Hugues III van Oisy | F2714 Group Sheet | |
| Mother | Hildegarde van Mons | F2714 Group Sheet | |
| Female + Mathilde van Béthune |
| Birth | ||
| Death | ||
| Burial | ||
| Spouse | Everhard Radulf III van Mortagne | F2043 | |
| Marriage | ||