Sackville is the second son of
William Sackville, 10th Earl De La Warr (died February 1988) and Anne Rachel Devas, and his brother is
William Herbrand Sackville, the 11th
Earl De La Warr. In 1979, he married Catherine Thérèsa Windsor-Lewis, daughter of
Brigadier James Charles Windsor-Lewis. They have two children, both adopted. He was privately educated at
Eton College, and then studied at
Lincoln College, Oxford. He began his professional career in
merchant banking. ==Parliamentary career==