William married Anne Hutchins, daughter of Sir George Hutchins. They had four sons: Hutchins Williams, Frederick, William-Peere, George and two daughters: Anne Williams, and Louisa .
Burke, Bernard. A Genealogical and Heraldic Dictionary of the Landed Gentry of Great Britain and Ireland. London: Harrison, 1858. (p. 414) googlebooks Retrieved 7 February 2009