Nielsen Hayden genealogy
Family: Robert de Vipont / Isabel fitz John (F1450)
m. Aft 19 Nov 1242John de Vipont (1210-1241) 
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| John fitz Geoffrey (1205-1258)
|
Maud fitz John ( -1301)  |
| Avelina fitz John ( -1274) |
| Joan fitz John ( -1303) |
| Robert de Vipont (1234-1264)
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| Isabel de Vipont (1248-1291) |