John (Sir) (of Blankney) Deincourt
- Yes, date unknown
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| John (2nd Lord Willoughby) De Willoughby | |
| B: | 6 Jan 1303-1304 |
| D: | 13 Jun 1349 |
| Joan (of Edgefield) Roscelyn | |
| M: | 2 Jul 1323 |
| D: | Yes, date unknown |
| Margaret Deincourt | |
| D: | Yes, date unknown |
| Robert (1st Lord Willoughby) De Willoughby | |
| B: | Between 1250 and 1260 |
| D: | Bef 25 Mar 1317 |
| William 2nd Baron Deincourt | |
| D: | 2 Jun 1364 |
| Milicent La Zouche | |
| D: | Yes, date unknown |
| John Deincourt | |
| D: | Yes, date unknown |
| Edmund (Sir) 1st Baron Deincourt | |
| D: | Yes, date unknown |
| John (Sir) (of Blankney) Deincourt | |
| D: | Yes, date unknown |
| Agnes (of Raby) De Neville | |
| D: | Yes, date unknown |