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Male William Fitzwilliam Click to view William Fitzwilliam in the family tree

William was born about 1052 in Of, Breteuil, Normandy, France.1   William's father was William Fitzosbern and his mother was Alice (Adelise) DeToeni.  His paternal grandparents were Unknown Osbern and Emma Of Ivry; his maternal grandparents were Roger "The Spainiard" Toeni (Conches) and Godeheut (Godehilde) Borrell. He had four brothers and a sister, named Roger De, Ralph, John, Richard and Emma.  He was the oldest of the six children.1 

1 phelps1609.FTW
Further source/citation:
World Family Tree Vol. 16, Ed. 1 @ Tree #1609