Robert II de Grandmesnil was born circa 1075 to Hugues I de Grandmesnil (1030-1093) and Aélis de Beaumont-sur-Oise (c1056-1091) and died 1 June 1136 Normandy, France of unspecified causes. He married Agnès de Briquessart (c1080-c1100) . He married Emma d'Estouteville (-1125) . He married Lucy de Beaumont-au-Maine .
Children
| Name | Birth | Death | Joined with |
| Guillaume de Grandmesnil (c1100-c1147) | 1100 | 1147 | Beatrix de Rye |
| Name | Birth | Death | Joined with |
| Beatrice de Grandmesnil (c1095-) | 1095 England | Hubert III de Rye (-1162) | |
| Hugues de Grandmesnil | |||
| Agnès de Grandmesnil | |||
Siblings
| Name | Birth | Death | Joined with |
| Yves de Grandmesnil | |||
| Robert II de Grandmesnil (1075-1136) | 1075 | 1 June 1136 Normandy, France | Agnès de Briquessart (c1080-c1100) Emma d'Estouteville (-1125) Lucy de Beaumont-au-Maine |
| William de Grandmesnil | |||
| Hugh de Grandmesnil | |||
| Aubrey de Grandmesnil | |||
| Rohais de Grantemesnil (1080-c1127) | 1080 | 1127 | Robert II de Courcy (-1131) |
| Agnes de Grandmesnil (-1094) | Normandy, France | 1094 England | William de Say (-c1086) |
| Adeline de Grandmesnil | |||
| Hawise de Grandmesnil | |||
| Matilda de Grandmesnil | |||
Residences
Footnotes (including sources)
| ‡ General |