| Father | Roger Mortimer ,Baron Wigmore (1221 - 1282) |
| Mother | Maud De Braose (1224 - 1300) |
| Sibling | Isabella De Mortimer (1248 - 1292) |
| Sibling | Sir, Edmund Mortimer (1239 - 1303) |
| Sibling | Joanne De Mortimer (1252 - 1337) |
| Sibling | Geoffrey De Mortimer (1254 - ) |
| Sibling | Roger De Mortimer (1256 - 1326) |
| Sibling | Hugh De Mortimer (1259 - ) |
| Sibling | Llywelyn De Mortimer (1261 - ) |
| Sibling | Robert De Mortimer (1269 - ) |
| Sibling | Catherine Mortimer ( - ) |
| Sibling | Maud De Mortimer (1249 - ) |
| Sibling | Margaret De Mortimer (1269 - 1297) |
| Sibling | Hugh Dealbini ( - 1243) |
| Sibling | Roger Lord (1267 - ) |
| Sibling | Alicia De Mortimer (1247 - 1280) |
| Sibling | William De Mortimer (1252 - 1304) |
| Sibling | Lord Roger (1267 - ) |
| Sibling | Ralph De Mortimer (1250 - 1274) |
| Sibling | Margaret De Vere ( - 1297) |
| Sibling | Edmund Mortimer (1261 - 1303) |
| Sibling | Isolt De Mortimer Lady of The Manor of Eastingdon (1260 - 1336) |