Question: Dame Ann Parker Bowles was the former mother in law of Camilla Rosemary Shand through which son? 
Context: Thomas Henry Charles Parker Bowles ( ; born 18 December 1974) is a British food writer and food critic.  Parker Bowles is the author of five cookbooks and in 2010 won the Guild of Food Writers 2010 award for his writings on British food.  He is known for his appearances as a judge in numerous television food series and for his reviews of restaurant meals around the UK and overseas for "GQ," "Esquire," and "The Mail on Sunday." The Lord Chamberlain's Office is a department within the British Royal Household.  It is concerned with matters such as protocol, state visits, investitures, garden parties, the State Opening of Parliament, royal weddings and funerals.  For example, in April 2005 it organised the wedding of Charles, Prince of Wales and Camilla Parker Bowles.  It is also responsible for authorising use of the Royal Arms. Dame Ann Parker Bowles ("née" de Trafford; 14 July 1918 – 22 January 1987) was a British aristocrat and Girl Guides leader.  Through her eldest son Andrew, she was the former mother-in-law of Camilla Rosemary Shand who later became The Duchess of Cornwall. Whatever Love Means is a TV movie about Camilla Parker Bowles and Prince Charles.  it premiered in December 2005 on ITV1.  The story centers on Charles and Camilla's relationship in the early 1970s until 1981. Emma Parker Bowles (born 8 December 1974 in London), daughter of Richard Eustace Parker Bowles and Camilla Younger, is the niece of Camilla, Duchess of Cornwall. Camilla, Duchess of Cornwall, ("née" Camilla Rosemary Shand, previously Parker Bowles; born 17 July 1947), is the second wife of Charles, Prince of Wales, the eldest child and heir apparent of Queen Elizabeth II.  Instead of using the title of Princess of Wales, she uses the title Duchess of Cornwall, her husband's secondary designation.  In Scotland, she is known as the Duchess of Rothesay.  In the event of Charles acceding to the throne, Camilla would become a queen consort; however, an official statement issued by Clarence House on the day of her marriage to Charles announced that she would be known as the Princess Consort. Alexander Faulkner Shand FBA (20 May 1858 – 6 January 1936) was an English writer and barrister.  Born in Bayswater, London, he was the son of Hugh Morton Shand, a Scot (grandson of William Shand, 2nd Laird of Craigellie), and his wife Edrica Faulkner, the Italian-born daughter of Joshua Wilson Faulkner of Kent.  He was a founding member of the British Psychological Society in 1901 and was awarded with honorary membership in 1934.  He was elected a Fellow of the British Academy (FBA).  Through his son Philip, he is the patrilineal great-grandfather of Camilla, Duchess of Cornwall. Brigadier Andrew Henry Parker Bowles OBE (born 27 December 1939) is a retired British Army officer.  He is the former husband of Camilla Parker Bowles, who is now the Duchess of Cornwall as the wife of the Prince of Wales. Laura Rose Lopes (née Parker Bowles; born 1 January 1978) is the daughter of Camilla, Duchess of Cornwall, and Andrew Parker Bowles.  Her mother's remarriage in 2005 made Charles, Prince of Wales, her stepfather. Middlewick House is a Grade II listed, Georgian-style house in Corsham, Wiltshire, England.  It is the home of Pink Floyd drummer Nick Mason and his wife Nettie, who acquired it from the previous owners, Andrew and Camilla Parker Bowles (now Camilla, Duchess of Cornwall), in 1995.
Answer: Andrew Henry Parker Bowles