| Father | Henry De Percy [EARL OF NORTHUM (1392 - ) |
| Mother | Eleanor De NEVILLE [COUNTESS OF NOR (1407 - 1440) |
| Sibling | Henry Percy [EARL OF NORTHUM (1421 - ) |
| Sibling | Catherine Percy ( - ) |
| Sibling | Margaret Percy ( - ) |
| Sibling | Eleanor Percy (1455 - ) |
| Sibling | Henry PERCY (1416 - ) |
| Sibling | Elizabeth PERCY (1426 - ) |
| Sibling | Ann PERCY (1428 - ) |
| Sibling | John Percy (1418 - ) |
| Sibling | Thomas Percy [BARON EGREMONT] (1422 - 1460) |
| Sibling | Catherine Percy [COUNTESS OF KEN (1423 - 1475) |
| Sibling | George Percy (1424 - 1474) |
| Sibling | Ralph Percy (1425 - 1464) |
| Sibling | Richard Percy (1426 - 1461) |
| Sibling | William Percy (1428 - 1462) |
| Sibling | George PERCY (1424 - ) |