| | Sir William FitzWilliam 1275–1340 Isabel Maud Deincourt 1275–1348 | | | | William FitzWilliam 1238–1295 Agnes de Metham 1234–1280 |
| | | Baron Edmund Deincourt 1248–1327 Isabel de Mohun 1243–1280 | | | | Agnes de Neville 1221–1293 | | | | Oliver Deincourt 1196–1246 Nichola de Camville 1180–1226 | | |
| | | Geoffrey FitzRobert de Neville 1197–1242 Joan Margaret de Monmouth 1201–1247 | | |
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| | | Baron Reynold II de Mohun of Dunster 1202–1257 Isabel de Ferrers 1226–1260 | | | | Sir William III de Ferrers 1193–1254 Margaret de Quincy 1218–1284 | | |
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