| Father | William Sir Knight Cornwallis (1460 - 1519) |
| Mother | Lady Elizabeth Stanford (1465 - 1537) |
| Sibling | Sir John Cornewalles Cornwallis "Knight" (1490 - 1544) |
| Sibling | Thomas Cornwallis (1496 - ) |
| Sibling | Catherine Cornwallis (1503 - ) |
| Sibling | Dorothy Cornwallis (1505 - ) |
| Sibling | Edward Cornwallis (1507 - ) |
| Sibling | William Cornwallis (1509 - ) |
| Sibling | Francis Cornwallis (1500 - 1568) |
| Sibling | Edith Cornwallis (1499 - 1559) |
| Sibling | Frances Cornwallis (1513 - ) |
| Sibling | Prudence Cornwallis (1497 - 1519) |
| Sibling | Lady Affra Cornwallis (1500 - 1560) |
| Sibling | Elizabeth Cornwallis (1513 - 1559) |
| Sibling | Sir Thomas Cornwallis (1490 - 1557) |
| Sibling | William Cornwallis (1497 - 1544) |