| Father | Henry DE PERCY (1300 - 1352) |
| Mother | Idonea DE CLIFFORD (1303 - 1365) |
| Sibling | Lady Maud DE PERCY (1340 - 1379) |
| Sibling | Robert DEPERCY (1335 - 1335) |
| Sibling | Margaret De PERCY (1318 - 1376) |
| Sibling | Richard DE PERCY "Lord of Semar near Scarborough" (1322 - ) |
| Sibling | William DEPERCY (1332 - 1369) |
| Sibling | Thomas DEPERCY (1328 - 1369) |
| Sibling | Earl Henry PERCY (1331 - 1368) |
| Sibling | Eleanor DE PERCY (1314 - 1361) |
| Sibling | Richard Lord Percy Henry DEPERCY (1320 - 1346) |
| Sibling | Earl Henry DE PERCY (1320 - 1368) |
| Sibling | Isabel DE PERCY (1345 - 1368) |