Stumbled over this by chance !
Pity he is not one of mine !
Ross-shire Journal 12th January 1917
'Sgt Roderick Tuach, Canadians, of Forest Hill Cottage, Muir Of Ord, son of Mr William Tuach, mason contractor, has also been awarded the Military Medal for bravery and devotion to duty on the field of battle. Before emigrating to Canada, Sgt Tuach was a member of C Company, 4th Seaforths, of which he was Colour Sergeant'.
That would make his mother Jessie Matheson and his grandmother Catherine Tuach (1824-1894).
Hope this helps someone !
Regards
Kyle McAllister