 Walter's mother was a daughter of George Butler of Ballyragget, who belonged to another branch of the same wide-branched family.The Butlers were an Old English family that played an important role in southern Ireland since the Norman invasion of that country.On 19 December 1732 he married Ellen (Eleanor) Morres, eldest daughter of Nicholas Morres of the Court, County Dublin, granddaughter of Sir John Morres, 7th Baronet Morres of Knockagh.