| Eltern | Geschwister | Kinder |
| Pires FitzHerbert | Joan FitzPiers | Peter Herbert |
| Reginald FitzPiers | Eleonor FitzPiers | |
| Isabel Ferrers | Ralph Mortimer | Piers FitzReginald |
| Hugh Mortimer | ||
| Roger Mortimer | ||
| Joan Mortimer | ||
| Robert Mortimer | ||
| Philip Mortimer | ||
| Philip de Mortimer | ||
| Sined Mortimer | ||
| Partner | ||
| Joan Vivonne |