| | Roger De Quincy [Earl of Winches 1174–1264 Helen (Elena) of Galloway 1208–1245 | | |
| | Margaret De Harcourt 1160–1234 Saher De Quincy [Earl of Winches 1150–1219 | | |
| | Petronilla (Pernel) Grentmesnil 1134–1212 Robert Blanchmains Harcourt [Earl of Leicest 1121–1190 | | |
| | Hugh De Grentmesnil [Baron of Hinckl 1092– Mrs-Hugh De Grentmesnil 1105– | | |
| | Ivo (Ives) De Grentmesnil 1064–1118 | | | | Gilbert De Gand (Gaunt) 1048–1094 | | | | | | | | Ermengarde De Flanders 1005– | | | | Arnoul Count De Gand 984– | | |
| | | Baudouin IV Barbatus , Flanders 967–1036 Otgive De Luxembourg 986–1030 | | |
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| | | Hugh De Montfort [Count of Montfo 1020– |
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| | | Hugh De Grentmesnil [Lord of Hinckle 1032–1098 Adeliza Or Alice Beaumont 1035–1091 | | | | Robert De Grentmesnil 1003–1038 Hawise De Eschauffen 1007– | | | | Gervase De Grentmesnil 977– |
| | | Giroie De Eschauffen 981– |
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| | | Yves II Beaumont -Sur-Oise twin] 1005– Mrs. Judith Beaumont 1008– | | | | Yves I Beaumont -Sur-Oise 975– | | | | Mrs. Yves De Beaumont 950– |
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