| Father | Sir John ST. JOHN Baron of Beauchamp (1460 - 1525) |
| Mother | Sybil verch MORGAN (1462 - 1502) |
| Sibling | Dame Catherine EDGECOMBE (1471 - 1553) |
| Sibling | Lady Catherine HOWARD (1478 - 1535) |
| Sibling | Margaret ST. JOHN (1480 - 1562) |
| Sibling | Alexander SAINT JOHN (1480 - ) |
| Sibling | Elizabeth ST. JOHN (1480 - ) |
| Sibling | Oliver ST. JOHN (1482 - ) |
| Sibling | Catherine ST. JOHN (1485 - ) |
| Sibling | Alice ST. JOHN (1486 - ) |
| Sibling | Elizabeth ST. JOHN (1488 - 1553) |
| Sibling | Alice ST. JOHN (1490 - 1552) |
| Sibling | Sybil ST JOHN (1490 - 1562) |
| Sibling | Margaretha JOHN (1490 - ) |
| Sibling | Sir Oliver ST JOHN (1492 - 1562) |
| Sibling | Elizabeth SAINT JOHN (1495 - 1562) |
| Sibling | Alexander ST JOHN (1497 - 1551) |
| Sibling | Lord John Van BLETSOE (1498 - 1527) |
| Sibling | John ST. JOHN III (1498 - 1562) |