Family: Sir Thomas Willoughby / Joan Arundel FitzAlan (F15964)
m. 16 Oct 1424
The parent family of Lady Isabel Willoughby is the Birth Family.
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 | Lucy Le Strange, , Baroness (1367-1405) |
| Elizabeth Willoughby (1384-1428) |
 | Robert Willoughby, 6th Baron (1385-1452) |
| Lady Margaret Willoughby (1399-1452) |
| Richard FitzAlan (1366-1419) |
| Baroness Alice de Burley, (Bruley) (1370-1436) |
| Philippa FitzAlan (1406- ) |
| Eleanor FitzAlan (1410- ) |
| Sir Thomas Willoughby (1387-1439)
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| Joan Arundel FitzAlan (1403-1439)
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| Lady Isabel Willoughby (1418-1471) |
| Dorothy Willoughby (1425- ) |
| Sir Robert of Parham Knight Eresby (1427-1465)  |
| Sir Robert Willoughby (1427-1465) |
| Lady Cecily Willoughby (1430-1480) |
| Henry Willoughby (1431-1465) |
| Joan Willoughby (1432-1462) |
| William Willoughby, Knt. (1432- ) |