Scot ancestors, either Canadian military or Scot?

[Dung Trumpet]

Wow! That's great info. I would not doubt they were SDG, as that is where my family is from. Thanks! Frank

You're welcome. Hazarding an educated guess with this one, but this gentleman appears to be a member of the 253rd (Queen's University) Highland Battalion, CEF, out of Kingston, Ontario. The shape of his cap badge nearly identical, and the description of the pipe band seems to match up closely. "1st May, 1917. Recruited throughout Canada from University students. Pipe Band, Argyll & Sutherland tartan; Balmoral with grey and red turkey feathers."

The 59th Battalion from Cornwall (pre-war militia unit) had plenty of its members join the 21st, 38th, 73rd, and 253rd battalions at various points, so that seems to square with your location. The 253rd was broken up to reinforce frontline units already at the front, and was disbanded following WWI. It is perpetuated by the Princess of Wales' Own Regiment in Kingston.