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The text below, was found on the internet and unfortunately, casts doubt on the information presented by J. C. Brooke, specifically the order of his marriages and sons birth (compare underlined text in the body text and boxes). Looking at other internet based Crathorne family trees, most favour Margaret as his first wife.

Born William son of John le Teuler who in 1310 bought two thirds of the manor from Arnald de Percy. William in 1322 bought the remaining third and was later knighted by Edward ll with the name of Sir William de Crathorne in 1327 having fought for the king at Boroughbridge in 1322. William married twice, first to Margaret Russell and secondly to Isobel Clervaux, producing at least 5 sons - John, Thomas, William, Nicholas and Matthew. There is also doubt, as to which of his wifes, was the mother of the sons. William also became Lord of the Manor of Ness, near Hovingham which he was given by Alice, daughter of Joan of Potto, in 1333.

William was killed in 1346 at the victory of Nevilles Cross near Durham against the Scots, 1 of only 4 knights lost in the battle. His widow Isabel, when applying for probate of his will, declared that he had gone into the church here and had made his will leaving money for the church roof, his armour to his friend Galfridus Hunter, and the remainder to her and his children.