Medlands suggests a death date of 17 June 1040[1]
Robert married Hawise daughter of Giroie and his wife Gisla de Bastenbourg.[1] Medlands names seven children:[1]
Hugues de Grandmesnil - Married Adelise de Beaumont
Adelise de Grandmesnil - Married Honfroi de Tilleul son of Amfrid and his wife.
and three more children with less certain existence.
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