Margaret Deincourt
- Yes, date unknown
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 | Robert (4th Lord Willoughby) De Willoughby Abt 1349-1396 |
| Robert (4th Lord Willoughby) De Willoughby | |
| B: | Abt 1349 |
| D: | 9 Aug 1396 |
| Alice Skipwith -Yes, date unknown |
| Alice Skipwith | |
| M: | Bef 1370 |
| D: | Yes, date unknown |
| John (3rd Lord Willoughby) De Willoughby Bef 1329-1372 |
| John (3rd Lord Willoughby) De Willoughby | |
| B: | Bef 6 Jan 1329 |
| D: | 29 Mar 1372 |
| Cecily (of Suffolk) De Ufford -Yes, date unknown |
| Cecily (of Suffolk) De Ufford | |
| M: | Bef 1349 |
| D: | Yes, date unknown |
| John (2nd Lord Willoughby) De Willoughby 1304-1349 |
| John (2nd Lord Willoughby) De Willoughby | |
| B: | 6 Jan 1303-1304 |
| D: | 13 Jun 1349 |
| Joan (of Edgefield) Roscelyn -Yes, date unknown |
| Joan (of Edgefield) Roscelyn | |
| M: | 2 Jul 1323 |
| D: | Yes, date unknown |
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| Margaret Deincourt -Yes, date unknown |
| Margaret Deincourt | |
| D: | Yes, date unknown |
| Robert (1st Lord Willoughby) De Willoughby 1260-Bef 1317 |
| Robert (1st Lord Willoughby) De Willoughby | |
| B: | Between 1250 and 1260 |
| D: | Bef 25 Mar 1317 |