Agnes Isabel Butler (1865–1886)
Agnes Isabel Howson (1886–1949)

Daughter of Henry Montagu and Georgina Isabella Butler. Married Edmund Whytehead Howson (1855–1905), an assistant master at Harrow School, in 1886.

Source

Nicholas Jenkins, W. H. Auden– ‘family ghosts’, auden.stanford.edu (accessed 10 November 2010)