He is married to Margaret Groes.
They got married
Child(ren):
The Breretons of Cheshire, England - breretonhistory.ca
breretonhistory.ca/Cheshire%20Breretons.pdf
Sir William Brereton I
Sir William Brereton I lived during the time of King John18 and King Henry III19. He married Margaret Groes and had issue:
William Brereton
Gilbert Brereton
Margaret Brereton married Sir John Delves (King Henry's brother)
John Brereton
Ralph Brereton, Rector of Davenham
Robert Brereton
Hugh Brereton
Jane Brereton married Lord Adam de Bostock
The data shown has no sources.