She married the Antarctic explorer Captain Robert Scott, R.N., on 2 September 1908, and a year later gave birth to their son Peter Scott, ("I know you will keep him in the open air")who became famous in broadcasting, ornithology, painting, conservation ("Make the boy interested in natural history if you can")and sport. In 1910, she accompanied her husband to New Zealand to see him off on his journey to the South Pole. A biographer of the Norwegian explorer Fridtjof Nansen has suggested that, in her husband's absence, she began a brief affair with Nansen, the mentor of Scott's rival Amundsen. In February 1913, while sailing back to New Zealand to greet Scott on his return, she learned of his death in Antarctica in March 1912.
In 1922, she married the politician Edward Hilton Young. Her second son, Wayland Hilton Young (1923–2009) was a writer and politician. Her grandchildren include Emily Young, artist, and Louisa Young, writer.