| Father | Roger MORTIMER (1287 - 1330) |
| Mother | Joan De GENEVILLE (1285 - 1356) |
| Sibling | Maud De MORTIMER (1307 - 1345) |
| Sibling | Margaret De MORTIMER (1308 - 1337) |
| Sibling | Roger De MORTIMER (1309 - ) |
| Sibling | Catherine (Katherine) De MORTIMER [Countess Of War (1309 - ) |
| Sibling | Beatrice De MORTIMER (1311 - 1383) |
| Sibling | Agnes De MORTIMER [Countess Of Pem (1313 - 1368) |
| Sibling | Joane De MORTIMER (1314 - 1337) |
| Sibling | Blanche De MORTIMER (1316 - 1347) |
| Sibling | Geoffrey De MORTIMER (1317 - ) |
| Sibling | John De MORTIMER (1321 - ) |
| Sibling | Johanna MORTIMER (1322 - ) |
| Sibling | Agnes MORTIMER (1326 - ) |
| Sibling | Matilda MORTIMER (1328 - ) |