Question: Which Scottish actor and singer is the father of actor Iain Armitage?

Context articles: Young Sheldon
Iain Borb MacLeod
Iain Armitage
Iain Robertson
Iain De Caestecker
Iain Blair
Vaughn Edwards
Euan Morton
Sheldon Cooper
Tony Osoba

Young Sheldon (stylized as young Sheldon) is an American television sitcom on CBS created by Chuck Lorre and Steven Molaro.
 The series is a spin-off prequel to "The Big Bang Theory" and follows the character Sheldon Cooper at the age of 9, living with his family in East Texas and going to high school.
 Iain Armitage stars as young Sheldon, alongside Zoe Perry, Lance Barber, Montana Jordan, and Raegan Revord.
 Jim Parsons, who portrays an adult Sheldon Cooper on "The Big Bang Theory", narrates the series and serves as an executive producer.
Iain Borb MacLeod (Scottish Gaelic: Iain Borb MacLeòid; Anglicised as: John "the Turbulent" MacLeod) (1392–1442) is considered to be the sixth chief of Clan MacLeod.
 He is the first MacLeod chief to which heraldry can be assigned.
 Clan tradition states that he was a minor at the time of his father's death and for six years an incompetent guardian led the clan to its lowest point in clan history.
 After reaching the age of maturity, Iain Borb managed to acquire some of the clan's lost lands and led his clan and his kinsmen (the MacLeods of Lewis) in the Battle of Harlaw, in 1411.
 Iain Borb was wounded in the head during the conflict; the wound never completely healed and confined him to his home on Pabbay for much of his life.
 Tradition states that he died when this wound re-opened during a fencing/wrestling match.
 There is some disagreement as to which of his son's were the eldest; however, his son William Dubh was the one who finally succeeded to the chiefship, following his death in 1442.
Iain Armitage (born July 15, 2008) is an American child actor and web-based theater critic.
 He is the son of actor Euan Morton and theater producer Lee Armitage.
 He is the grandson of government official Richard Lee Armitage.
 He played Ziggy Chapman in the HBO miniseries "Big Little Lies".
 In January 2017, Armitage starred in an episode of "", playing a young child, Theo Lachere, who has been kidnapped.
Iain Robertson (born 27 May 1981) is a BAFTA award winning Scottish actor.
 He portrayed Lex in cult Glasgow gang film, "Small Faces", though Robertson is also known for his work in the long-running children's drama, "Grange Hill" and "The Debt Collector", also starring Billy Connolly.
Iain De Caestecker ( ; born 29 December 1987) is a Scottish actor, best known for his roles in films "Shell" (2012), "In Fear" (2013), "Not Another Happy Ending" (2013), "Lost River" (2014) and as Agent Leopold Fitz in the television series "Agents of S.H.I.E.L.D."
Iain Blair (12 August 1942 – 3 July 2011) was a Scottish actor and author who, using the pen name Emma Blair wrote a series of romantic novels.
Vaughn Edwards is a fictional character the BBC television drama "Spooks" being portrayed by actor Iain Glen.
 He appears in the ninth series as a mysterious figure from the past of Lucas North.
 He therefore acts as the series's main antagonist.
Euan Douglas George Morton (born Iain Middleton; 13 August 1977) is a Scottish actor and singer.
 He is known for his role as Boy George in the musical "Taboo", receiving nominations for the Laurence Olivier Award and Tony Award for his performance.
Sheldon Lee Cooper, Ph.D., Sc.D.
, is a fictional character in the CBS television series "The Big Bang Theory" and "Young Sheldon", portrayed by actor Jim Parsons in "The Big Bang Theory" and Iain Armitage in "Young Sheldon".
 For his portrayal, Parsons has won four Primetime Emmy Awards, a Golden Globe Award, a TCA Award, and two Critics' Choice Television Awards.
 The childhood of the character is the focus of "Young Sheldon", the show being set in 1989, when 9-year-old Sheldon, who has skipped ahead four grades, starts high school alongside his older brother.
Tony Osoba (born 15 March 1947) is a Scottish actor best known for his role as Jim 'Jock' McClaren in the popular 1970s British sitcom "Porridge".
 He also appeared in its sequel "Going Straight".
 Osoba was the first black Scottish actor to appear on primetime television when he appeared in the series.
 Since then, he has appeared twice in Coronation Street, first as Wesley McGregor in 1982, and secondly as Mike Baldwin's boss Peter Ingram for a few episodes in 1990, before the character was killed off.