Question: Who is the father of AFL medium-sized forward Tory Dickson?

full_context: Document 1: John Vickery (footballer): John Vickery (born 6 July 1951) is a former Australian rules footballer who played with Collingwood in the Victorian Football League (VFL). He is the father of Hawthorn footballer Ty Vickery.
Document 2: Tory Dickson: Tory Dickson (born 26 September 1987) is an Australian rules footballer who plays for the Western Bulldogs in the Australian Football League (AFL). He plays mainly as a medium-sized forward.
Document 3: Aaron Sandilands: Aaron Sandilands (born 6 December 1982) is an Australian rules footballer who plays for the Fremantle Football Club in the Australian Football League (AFL). Originally from Mount Barker, a small town in the Great Southern region of Western Australia, Sandilands played with the East Fremantle Football Club in the West Australian Football League (WAFL), before being rookie listed by Fremantle in the 2002 Rookie Draft. Upgraded from the rookie list at the end of the 2002 season, he made his senior debut for the club in round one of the 2003 season. At 211 cm tall, and with a peak weight of 120 kg , Sandilands became the heaviest and equal-tallest player to ever play in the AFL. Due to his height, Sandilands plays almost exclusively as a ruckman, occasionally resting in the forward line. At times, he has been described as the best ruckman in the competition, and was named in the All-Australian team in three consecutive years between 2008 and 2010. Sandilands is a dual Doig Medallist as Fremantle's best and fairest player, won in 2009 and 2015.
Document 4: Marcus Bontempelli: Marcus Bontempelli (born 24 November 1995) is an Australian rules footballer who represents the Western Bulldogs in the Australian Football League (AFL). Bontempelli was drafted by the Bulldogs with pick 4 in the 2013 AFL Draft. After a successful debut season, he won the Best First-Year Player award for 2014 and was runner up in the 2014 AFL Rising Star award, finishing one vote behind Lewis Taylor.
Document 5: Ian Dickson (footballer): Ian William Dickson (born Maxwelltown (now part of Dumfries), South-West Scotland, September 1902; died 1976) was a Scottish professional footballer whose played as a forward. He played for Queen of the South, Aston Villa and Middlesbrough. He was the grandfather of another Ian Dickson, the Australian television and radio personality.
Document 6: Glenn Dickson (footballer): Glenn Dickson (born 5 November 1954) is a former Australian rules footballer who played with Richmond in the Victorian Football League (VFL). He is the father of Tory Dickson.
Document 7: Dustin Martin: Dustin Martin (born 26 June 1991) is a professional Australian rules footballer playing for the Richmond Football Club in the Australian Football League (AFL). Martin grew up in Castlemaine, Victoria, and as a junior played for the Castlemaine Football Club and the Bendigo Pioneers. He was drafted by Richmond with the third pick in the 2009 national draft, and made his debut for the club in round one of the 2010 season. He was nominated for the 2010 AFL Rising Star award, but was ineligible due to suspension.
Document 8: Dom Tyson: Dom Tyson (born 8 June 1993) is a professional Australian rules footballer playing for the Melbourne Football Club in the Australian Football League (AFL). A midfielder, 1.86 m tall and weighing 86 kg , Tyson is capable of contributing as both an inside and outside midfielder. He was recognised as a talented footballer from a young age when he represented Victoria in the under 12 championships. Queries were raised over his versatility as a midfielder after he missed out on selection in the under 16 championships. Despite this, he was recruited by the Oakleigh Chargers in the TAC Cup as a bottom-aged player, and was named their captain the following year. In addition, he represented Vic Metro in the 2011 AFL Under 18 Championships, which earned him All-Australian honours. His improvement towards the end of his junior career saw him recruited by the Greater Western Sydney Giants with the third selection in the 2011 AFL draft. He made his AFL debut in the 2012 season and earned an AFL Rising Star nomination. After two years with Greater Western Sydney and playing in thirteen matches, he was traded to the Melbourne Football Club during the 2013 trade period.
Document 9: Lewis Young (Australian footballer): Lewis Young (born 20 December 1998) is a professional Australian rules footballer playing for the Western Bulldogs in the Australian Football League (AFL). He was drafted by the Western Bulldogs with their third selection and forty-ninth overall in the 2016 national draft. He made his debut in the twenty point win against Carlton at Etihad Stadium in round seventeen of the 2017 season.
Document 10: Andrew Gowers (footballer): Andrew Gowers (born 11 April 1969) is a former Australian rules footballer who played for Hawthorn and Brisbane in the wing position. Gowers played in Hawthorn's 1991 AFL Grand Final victory. Andrew is the son of Trevor Gowers who played 24 senior games for Richmond between 1964 and 1966.
Document 11: Glenn James: Glenn Robert James OAM is a former Australian rules football umpire in the Victorian Football League. James umpired the 1982 and 1984 VFL Grand Finals and is recognised as the only Indigenous Australian to umpire VFL or AFL football.
Document 12: Angus Brayshaw: Angus Brayshaw (born 9 January 1996) is a professional Australian rules footballer playing for the Melbourne Football Club in the Australian Football League (AFL). A midfielder, 1.87 m tall and weighing 90 kg , Brayshaw is capable of contributing as both an inside and outside midfielder. He has strong family connections in Australian sport whereby his father, Mark Brayshaw, is a former player and the current AFL Coaches' Association Chief Executive Officer, his uncle, James Brayshaw, is a former state cricketer, former North Melbourne chairman and a sport media personality, and his grandfather, Ian Brayshaw, is a former state cricketer and footballer with the Claremont Football Club.
Document 13: Ty Vickery: Tyrone "Ty" Vickery (born 31 May 1990) is an Australian rules footballer playing for the Hawthorn Football Club in the Australian Football League (AFL). He previously played for the Richmond Football Club from 2009 to 2016. He is the son of former Collingwood player John Vickery.
Document 14: Dick Flynn (Australian footballer): Richard Charles "Dick" Flynn (2 November 1926 – 25 July 1949) was an Australian rules footballer who played with North Melbourne in the Victorian Football League (VFL). He was born in Broken Hill and died in Parkville.
Document 15: Ron Barassi: Ronald Dale "Ron" Barassi Jr {'1': ", '2': ", '3': ", '4': "} (born 27 February 1936) is a retired Australian rules football player and coach. During a long and decorated career, Barassi has been one of the most important figures in the history of Australian football. His father Ron Barassi Sr., also a prominent Australian rules footballer, was killed at Tobruk during World War II. The young Barassi spent his latter teenage years living with Norm Smith, coach of the Melbourne Football Club and a former teammate of his father.
ground_truth: Glenn Dickson