Her father who was an ironmaster[3] had been married before and he had two children including the explorer and diplomat Gertrude Bell.

In 1904 she recorded her marriage to Charles Trevelyan including an itemised list of gifts and givers that was published in the newspaper.

[10] She recorded in her diary in 1939 that the tradition at Christmas was that the whole family would begin the day in their double bed at Wallingham before going to the main hall where simple presents would be laid out in age order.

[11] In 1942, her socialist husband donated Wallington Hall, complete with its large estate of farm land, to the National Trust.

The Trevelyan papers are held by Newcastle University including her diaries and her extensive photograph albums.