Stevens was born in Marylebone, Central London, England. He was son of
Major Charles Greville Bartlett Stevens ("Stewart-Stevens" following his second marriage, to Muriel Stewart, 10th
Lady of Balnakeilly,
Pitlochry,
Perthshire, Scotland) and his first wife Elizabeth ("Betty"), daughter of
Sir Edward Hulton, 1st Baronet and his second wife, the
music hall artist, actress and singer
Millie Lindon. Betty died shortly after her son's birth. His father blamed Stevens for his mother's death, and the child was left in a flat near to
Baker Street in London, attended to by nannies, a maid, a cook, a priest and a chauffeur. He was maternal nephew of the magazine publisher Sir
Edward George Warris Hulton. His step-brother was the military officer Sir
Blair Stewart-Wilson,
Equerry to
Her Majesty The Queen and Deputy
Master of the Household in the
Royal Household from 1976 to 1994. He was married to Jane Armyne Sheffield, daughter of John Vincent Sheffield and wife Ann Margaret Faudel-Phillips, paternal granddaughter of
the 6th Baronet Sheffield and maternal granddaughter of
the 3rd and last of the Faudel-Phillips baronets, and a Lady-in-Waiting to
Princess Margaret, for 23 years until 1979. Their daughter Pandora married property developer Charles Delevingne and they have three daughters, Chloe, and models
Poppy Delevingne and
Cara Delevingne. Stevens was a long-term partner of the philanthropist Dame
Vivien Duffield until they separated in 2005. In 2008, he married Emma Margaret Ismay Cheape, daughter of the late Sir
Iain Tennant and former wife of Angus Ismay Cheape. ==References==