I gathered things that referenced a Duncan Barnes, just in case there was something you hadn't seen. If you have everything already, Im sorry for sending what you already know. My main focus in genealogy is in Newfoundland, so I will keep my eyes open for you.
Notre Dame Bay Region - West District
Little Bay Islands - Methodist Marriage Records (partial)http://nl.canadagenweb.org/ndwest_parrec_littlebayisland_met...
Record #136. Uriah ROWSELL, aged 32 of Hulls Bay to Sarah Ann BARNES, aged 24 of Boot Harbour on February 13, 1882 by Joseph LISTER. Witnesses were Duncan BARNES, Ada BARNES and James PARMITER
(Note- perhaps this Duncan Barnes is a sister to Ann Barnes.or it could also be the Duncan Sr. Either way it might give you another name to work with. You might find more references to a Sr. in other siblings records etc.)http://ngb.chebucto.org/Vstats/tw-v91-meth-mar-lbi.shtml
Feb 13 1883 William C Barnes, 26, bach, fish, Boot Hr &
Tryphena Davis, 23, spin, Harbour Grace, Conception Bay.
At Boot Hr, METH. W: Duncan Barnes, Malvina Thistle.
Feb 13 1883 Uriah Rowsell, 32, widower, fish, Halls Bay &
Sarah Ann Barnes, 24, spin, Boot Hr. At Boot Hr, METH.
W: Duncan Barnes, Ada Barnes.
Mary A. BARNES beloved wife of Duncan BARNES who departed this life Sept. 24, 1907 aged 26 years.
Also their beloved child Wilfred BARNES died Apr. 20, 1907 aged 9 months.http://ngb.chebucto.org/Vstats/civil-mar-1901-1908-fogo.shtm...
May 2 1903 Boot Hr Duncan BARNES 40 wid master mariner Meth Boot Hr Simeon Thistle, Lucy Thistlehttp://ngb.chebucto.org/Vstats/civil-mar-1905-1909-fogo.shtm...
Sep 17 1907 Arthur P (V) PENNEY 21 bach fish ME Harrys Harbour Frank Dickenson Roland Evans, Susie Green
Harrys Harbour Regina GREEN 19 spin ME Harrys Harbour Arthur Vance PENNEY was b Feb 9 1887 Harrys Hr - d May 20 1910 HH of Brights Disease; s/o S. PENNEY & Duncan BARNES (not married). Regina was b Nov 30 1876 HH, d/o William Green & Elizabeth Mary King. http://ngb.chebucto.org/Vstats/civil-reg-death-1902-1912-tw....
Arthur PENNY d May 20 1910 Harrys Harbour Brights Disease 22 years ME
fishing Harrys Harbour Harrys Harbour Arthur Vanse b Feb 9 1887 Harrys Hr, s/o S. PENNY & Duncan BARNES (parents not married). http://ngb.chebucto.org/Vstats/lbi-uc-bap-1865-1891-tw.shtml
Wentworth BARNES Duncan & Fanny b Oct 13 1887 Little Bay bap Oct 15 1887
Arthur Vanse PENNY S. PENNY & Duncan BARNES PENNY b Feb 9 1887 Harrys Harbour bap Nov 6 1887 parents not married. http://ngb.chebucto.org/Vstats/civil-reg-death-1900-1903-tw....
Frances BARNES (female) d July 13 1902 Pilleys Island inflammation of lungs 34 years ME
St Anthony Boot Harbour NOTES: headstone at Boot Harbour UC Cemetery names her as wife of Duncan Barnes. He remarried 1903 to Mary Butt.
Duncan Barnes in entry for Duncan Barnes, "Ontario Deaths,1869-1937 and Overseas Deaths, 1939-1947
name: Duncan Barnes
event date: 01 Jun 1935
event place: Toronto, , Ontario
estimated birth year: 1863
father: Duncan Barnes
mother: Jane Parsons
reference number: 004330
film number: 2413413
digital folder number: 4530370
image number: 01320