Sir Robert Cecil Muir Mackenzie of Delvine, 5th Bt. (1891-1918) (1891–1918) Parents Anne Elizabeth Augusta Johnstone-Gordon Sir Robert Smythe Muir Mackenzie of Delvine, 4th Bt. Children Sir Robert Henry Muir Mackenzie of Delvine, 6th Bt. Siblings Sophia Helen Muir Mackenzie Geraldine Muir Mackenzie Cecily Emmeline Muir Mackenzie Partners Kate Brenda Blodwen Jones