sentences:  He was the only son of Archibald Acheson, 2nd Earl of Gosford of Gosford Castle, County Armagh and the former Mary Sparrow (1777–1841).He had four younger sisters, including Lady Mary Acheson (wife of James Hewitt, 4th Viscount Lifford) and Lady Millicent Acheson (wife of Dr. Henry Bence Jones).His paternal grandparents were Arthur Acheson, 1st Earl of Gosford and the former Millicent (née Pole) (a daughter of Lt.-Gen. Edward Pole).