| Father | Henry De Beaumont De Beaumont 4th Earl of Buchan, Jure Uxoris (1285 - 1339) |
| Mother | Alice Comyn Countess of Buchan (1291 - 1349) |
| Sibling | Baron John De Beaumont (1318 - 1342) |
| Sibling | Beatrice De Beaumont (1319 - ) |
| Sibling | Thomas De Beaumont (1313 - 1369) |
| Sibling | Elizabeth Beaumont (1330 - 1400) |
| Sibling | Elizabeth De Beaumont Baroness Audley (1328 - 1400) |
| Sibling | Thomas Beaumont (1315 - 1369) |
| Sibling | Henry De Beaumont (1312 - ) |
| Sibling | Duchess of Lancaster Isabel De Beaumont (1315 - 1361) |
| Sibling | Alice De Beaumont (1311 - ) |
| Sibling | Richard Beaumont (1313 - ) |
| Sibling | Beatrice De Beaumont (1324 - 1410) |
| Sibling | Joan Beaumont (1347 - 1400) |
| Sibling | Catherine De Beaumont (1310 - 1368) |