Malcolm (born 1889) was a son of Donald Macdonald and Jessie Macaulay, 2 Crowlista. He served in the Royal Naval Reserve during the First World War and took part in the action involving RMS Carmania and the German vessel SMS Cap Trafalgar in 1914.

Malcolm was unmarried. During the 1920s he moved to 3 Timsgarry with his sister Christina and their nephew Malcolm John and niece Effie (Henrietta), whose parents were no longer living. 

He had an elder brother who was also called Malcolm (the father of Malcolm John and Effie).