| Father | Sir Thomas Jermyn (1480 - 1552) |
| Mother | Lady Anne Spring (1494 - 1568) |
| Sibling | Edmund Jermyn (1505 - 1572) |
| Sibling | Robert Jermyn (1507 - ) |
| Sibling | Margaret Jermyn (1508 - 1565) |
| Sibling | Antonius Jermyn (1509 - 1569) |
| Sibling | Thomas Ambrose Jermyn (1510 - 1577) |
| Sibling | Mary Jermyn (1511 - ) |
| Sibling | Bridget Jermyn (1512 - 1561) |
| Sibling | Anne Jermyn (1517 - ) |
| Sibling | Elizabeth Jermyn (1518 - 1572) |
| Sibling | Jane Joane Andrewe Jermain (1520 - 1598) |
| Sibling | Agnes Jermyn (1520 - 1599) |
| Sibling | Frances Jermyn (1525 - ) |
| Sibling | Ursala Agnes Jermyn (1529 - 1562) |
| Sibling | Martha Jermyn (1529 - 1587) |
| Sibling | Barbara Jermyn (1532 - 1562) |
| Sibling | Katherine Periente (1532 - ) |