Gerald fitz Walter Windsor's father was Walter fitz Otho and his mother was Beatrice. His paternal grandfather was Otho. He was an only child. He died before 1136.
General Notes
pg 151, "Ancestral Roots of Sixty Colonists etc" by Frederick Lewis Weiss, 6th Edition
pg 204, Burke's " A Genealogical History of the Dormant, Abeyant, Forfeited and Extinct Peerages of the British Empire" published 1883