| Father | Hugh Willoughby (1390 - 1448) |
| Mother | Margaret Freville (1430 - 1493) |
| Sibling | Isabel Willoughby (1418 - 1471) |
| Sibling | Robert Willoughby, Esq. (1406 - 1465) |
| Sibling | Lady Alice Willoughby (1410 - 1509) |
| Sibling | Richard Willoughby (1412 - 1471) |
| Sibling | Isabel (Willoughby) Bessingby (1413 - 1475) |
| Sibling | Henry Willoughby (1419 - ) |
| Sibling | Marjory de Willoughby (1420 - ) |
| Sibling | John Willoughby (1423 - 1477) |
| Sibling | Sir Baldwin Willoughby V (1427 - 1492) |
| Sibling | Maude Willoughby (1429 - 1457) |
| Sibling | Joyce Willoughby (1429 - 1469) |