Question: Margaret Trudeau had a son who died in an avalanche in what year?

Context articles: Alexandre Trudeau
Margaret of Huntingdon, Lady of Galloway
Margaret Vandercook
2nd Genie Awards
Margaret Tudor
Martin De La See
Polly Shannon
Kings and Desperate Men
Margaret Trudeau
Michel Trudeau

Alexandre Emmanuel "Sacha" Trudeau (born December 25, 1973) is a Canadian filmmaker, journalist and author of "Barbarian Lost".
 He is the second son of Canada's former Prime Minister Pierre Trudeau, and Margaret Trudeau, and the younger brother of Canada's current Prime Minister Justin Trudeau.
Margaret of Huntingdon (died before 1228) was the eldest daughter of David, Earl of Huntingdon (died 1219) and his wife, Maud (died 1233), sister of Ranulf III, Earl of Chester (died 1232), and daughter of Hugh II, Earl of Chester (died 1181).
 Margaret was the second wife of Alan, Lord of Galloway (died 1234).
 She and Alan married in 1209, and had a family of a son and two daughters.
 The elder daughter, Christiana, married William de Forz (died 1260).
 The younger daughter, Dervorguilla (died 1290), married John de Balliol, Lord of Barnard Castle (died 1268).
 Margaret and Alan's son, Thomas—Alan's only legitimate son—may have lived into the 1220s, but died young.
Margaret O'Bannon Womack Vandercook (January 12, 1877 – February 7, 1958) was an American writer of children's literature.
 Daughter of Joel Mayo Womack and Nannie Gibson (O'Bannon) Womack, she was born in Louisville, Kentucky, where she attended both public and private schools.
 In 1900 she married John Filkin Vandercook, who later became the first president of the United Press Association.
 He died in 1908.
 They had one son, John Womack Vandercook.
 Margaret spent her summers in Leonardo, New Jersey and winters in Gramercy Park, New York, but during her husband's lifetime she also spent several years living in Europe.
 Margaret Vandercook did not become a professional writer until after her husband's death, but has since been described at the queen of Camp Fire writers, writing 21 Camp Fire novels under her own name as well as the pseudonym "Margaret Love Sanderson."
 The pseudonym of Margaret Love Sanderson was also used by Emma Keats Speed Sampson, author of the Miss Minerva books.
 In addition to the Camp Fire Girls series, Margaret is also known for her other girls series books which include the Ranch Girls series, Red Cross Girls series, and Girl Scouts series.
 Additional works include stories, articles and poems for Harper's Bazar, Delineator, Pearson's Magazine, Book News Monthly, Paris Modes, and many other publications.
 She was also a member of the Louisville Kentucky Authors' Club.
The 2nd Genie Awards were held March 12, 1981, honouring Canadian films released the previous year.
 The ceremony was held at the Royal Alexandra Theatre and was hosted by Brian Linehan.
 The most notable sight of the evening was Prime Minister Pierre Trudeau escorting starlet Kim Cattrall; the moment received renewed media attention in March 2016, when the American newsmagazine "60 Minutes", in a profile of Justin Trudeau, ran a photo of the appearance while misidentifying Cattrall as Margaret Trudeau.
Margaret Tudor (28 November 1489 – 18 October 1541) was Queen of Scots from 1503 until 1513 by marriage to James IV of Scotland and then, after her husband died fighting the English, she became regent for their son James V of Scotland.
 She was born at Westminster Palace as the oldest daughter of Henry VII of England and Elizabeth of York, and granddaughter of Margaret Beaufort, Edward IV of England and Queen Elizabeth Woodville.
 Margaret Tudor had several pregnancies, but most of her children died young or were stillborn.
 As queen dowager she married Archibald Douglas, 6th Earl of Angus.
 Through her first and second marriages, respectively, Margaret was the grandmother of both Mary, Queen of Scots, and Mary's second husband, Lord Darnley.
 Margaret's marriage to James IV foreshadowed the Union of the Crowns – their great-grandson, James VI and I, was the first to be monarch of both Scotland and England.
Martin De La See (1420 – 15 December 1494) was the son of Brian De La See, by Maud, daughter and heiress of John Monceaux.
 He married firstly Margaret Spencer, daughter and heiress of Christopher Spencer, by whom they had a son Christopher, who died in his father's lifetime, and one daughter, Margaret.
 Margaret later married Sir Henry Boynton of Acklam, North Riding of Yorkshire.
 He married secondly Elizabeth, daughter of Philip Wentworth, Knight, of Nettlestead, Suffolk, by Mary Clifford, daughter of John De Clifford.
 He married for the third time, before 20 November 1494, Margery.
Polly Shannon (born September 1, 1973) is a Canadian actress.
 She is best known for her portrayal of Margaret Trudeau in the 2002 miniseries "Trudeau", a film about the late Prime Minister of Canada Pierre Trudeau.
Kings and Desperate Men is a 1981 Canadian hostage drama film directed, co-written and produced by Alexis Kanner.
 The film stars Patrick McGoohan as radio talk show host John Kingsley, Margaret Trudeau as his wife Elizabeth, and Kanner with Andrea Marcovicci as terrorists.
 The story is set within one day during Christmas Eve.
 The movie was made on a budget of 1.2 million and was filmed in Montreal.
Margaret Joan Trudeau ("née" Sinclair, formerly Kemper; born September 10, 1948) is a Canadian author, actress, photographer, former television talk show hostess, and social advocate for people with bipolar disorder.
 She is the former wife of Pierre Trudeau, 15th Prime Minister of Canada; and is the mother of Justin Trudeau, 23rd Prime Minister of Canada, and his brothers Alexandre and Michel.
 In 2013, Trudeau was awarded an honorary degree of Doctor of Laws from the University of Western Ontario in recognition of her work to combat mental illness.
Michel Charles-Émile Trudeau (October 2, 1975 – November 13, 1998) was the youngest son of Canadian Prime Minister Pierre Trudeau and Margaret Trudeau and the younger brother of current Prime Minister Justin Trudeau.
 He died in an avalanche on November 13, 1998, while skiing in Kokanee Glacier Provincial Park.