 | 4th Baron Willoughby de Eresby Robert Willoughby (1350-1396) 
|
 | Margery la Zouche (1352-1391)
|
| Sir Thomas Willoughby ( -1417)  |
| 5th Lord Strange of Knockin Roger Le Strange (1327-1382)
|
| Aline Fitzalan (1314-1386)
|
| 6th Baron John Le Strange (1352-1397) |
| Lucy Le Strange (1352-1406)
|
| Elizabeth Willoughby (1386- ) |
| Sir Thomas Willoughby (1387-1432) |
| Margery Willoughby (1390-1452) |
