Hi, I have come across this rather late in the day in pursuit of more information about the WW1 service of my relative, David Tuach who was killed on the Western Front. You may already have discovered this but the tradition in Scottish legal records is to preserve the family name of mothers as well as fathers, so that in your example, George's mother is recorded as Margaret Mackenzie or Tuach. I hope even at this late stage this is helpful. Best wishes, Karin