Harriet Dallas (1797-1876) was the daughter of Lieutenant General Sir Thomas Dallas. She married Major General Dickson, C.B. of Beenham House, Berkshire and was the mother of Lady Neeld, wife of Sir John Neeld, Bt. of Grittleton, Wiltshire.
William Dickson was Major General Dickson's youngest son. He served in the 16th (Queen's) Lancers and later became Lieutenant General William Dickson in 1896.