According to genealogist and researcher Dr. David Boles, Anne McQueen should be the mother of Dugal. I have personally corresponded with Dr. Boles over the parentage of Dugal McQueen.
Antiquarian Notes, Historical, Genealogical,and Social (Second Series): Inverness-shire Parish by Parish. Inverness: A. & W.Mackenzie.
↑ Historical Memoirs of the House and Clan of Mackintosh and of the Clan Chattan. London: Private print.
Dr. David B. Boles, https://bolesbooksblog.wordpress.com/2015/01/23/4-dugal-mcqueen-sco...
Boles, D.B. (2015). Boles-Barth Omnibus Ancestry. Tuscaloosa, AL: private print at Lulu.
Fraser-Mackintosh, C. (1897). Antiquarian Notes, Historical, Genealogical, and Social (Second Series): Inverness-shire Parish by Parish. Inverness: A. & W. Mackenzie.
Shaw, A.M. (1880). Historical Memoirs of the House and Clan of Mackintosh and of the Clan Chattan. London: Private print. [Note: This work is frequently shown as having been authored by A.M. Mackintosh, but the coverpage shows the author as A.M. Shaw, and the preface is signed "A.M.S."
https://bolesbooksblog.wordpress.com/2015/01/23/4-dugal-mcqueen-sco...
“Dugal, it was clear, was the son of John Macqueen by Anne, daughter of William Mackintosh, the 18th chief, and his wife Margaret Graham.”
I will move Dugal to son of Anne & John & disconnect her from Duncan.