I suggest you submit an Access to Information request to Immigration, Refugees and Citizenship Canada asking for any and all documents they have for Mr. Rott.
Searching for Wilhelm Rott who docked at Pier 21, Halifax, Nova Scotia on January 14, 1957 on the MS Seven Seas. I do not see him on your list.
There are no Johnstones but McDonalds from Crane River, Fort Alexander, Nelson House, Peguis, and Sandy Bay Bands. Please email email@example.com
Any Johnstone's or McDonald's from Selkirk Man area who gave up Indian status?