William De Grentmesnil

William's father was Hugh De Grentmesnil and his mother was Alice De Beaumont.  His maternal grandparents were Count Of Beaumont Ivo and UNKNOWN Judith. He had three brothers and five sisters, named Aubrey, Ivo, Robert, Adeliza, Agnes, Hawisw, Matilda and Rohais. He had a half-brother named Robert.