| Eltern | Geschwister | Kinder |
| Ethelinde Northeim | ||
| Otto Northeim | Ida Northeim | |
| Mechtild Northeim | Friedrich von Arnsberg | |
| Richenza Zwaben | Oda Werl | Hendrik Arnsberg-Rietberg |
| Siegfried Northeim-Boineburg | ||
| Koenraad Beichlingen | ||
| Hendrik Northeim | ||
| Partner | ||
| Koenraad Werl |