Sophia Helen Muir Mackenzie (died 1966) (d. 1966) Parents Sir Robert Smythe Muir Mackenzie of Delvine, 4th Bt. Anne Elizabeth Augusta Johnstone-Gordon Children Siblings Sir Robert Cecil Muir Mackenzie of Delvine, 5th Bt. Geraldine Muir Mackenzie Cecily Emmeline Muir Mackenzie