| Father | Earl Henry De Percy I (1392 - 1455) |
| Mother | Eleanor De Neville (1397 - 1472) |
| Sibling | Ann Percy (1428 - 1522) |
| Sibling | George Percy (1424 - 1474) |
| Sibling | Earl Henry De Percy II (1421 - 1461) |
| Sibling | Sir Ralph "The Gledd of Dunstanburgh" Percy (1425 - 1464) |
| Sibling | Lady Catharine Percy (1423 - 1472) |
| Sibling | William Percy (1428 - 1462) |
| Sibling | Joan Percy (1430 - 1482) |
| Sibling | Knight Richard Percy (1426 - 1461) |
| Sibling | Thomas Percy, 1st Baron Egremont (1422 - 1460) |
| Sibling | Joan Percy (1414 - 1483) |
| Sibling | Lady Eleanor Percy (1416 - 1452) |
| Sibling | John Percy (1418 - 1421) |
| Sibling | George Percy (1422 - 1460) |
| Sibling | Henry Percy (1272 - 1315) |
| Sibling | William Depercy (1428 - 1462) |
| Sibling | Richard Percy ( - ) |
| Sibling | Catherine Percy (1423 - 1504) |
| Sibling | Lady Katherine De Grey (1423 - 1475) |
| Sibling | Ursula (1432 - 1437) |
| Sibling | Lady Elizabeth York Duchess of Suffolk Plantagenet (1444 - 1504) |
| Sibling | Margaret Percy Pearce (1450 - 1486) |
| Sibling | George Percy (1424 - 1424) |
| Sibling | Algernon Percy (1421 - 1461) |
| Sibling | Eleanor Percy (1415 - ) |
| Sibling | Alan Percy (1430 - ) |
| Sibling | John Percy (1418 - 1418) |
| Sibling | Joan Percy (1415 - 1475) |
| Sibling | Ralph Percy ( - 1464) |
| Sibling | John Vincent Depercy (1424 - 1474) |
| Sibling | Margaret Percy (1447 - 1486) |
| Sibling | Thomas Percy (1422 - 1460) |
| Sibling | Jane Percy (1418 - ) |
| Sibling | Elizabeth Percy (1412 - 1455) |