The sisters are Lady Elcho, Mrs. Adeane, and Mrs. Tennant, all daughter of the Honorable Percy Wyndham. The painting was done in their London home on Belgrave Square. Sargent has arranged the women so that their mother, Madeline, is looking down upon them from the full portrait by George Frederick Watt.

Lady Elcho is the one behind. She is Mary Constance neè Wyndham (1862-1937) -- the oldest. She married Hugo Richard Wemyss Charteris Douglas, Lord Echo in 1883. Her brother-in-law was the Honourable Evan Charteris who did the first biography of Sargent shortly after John's death. Mary would have been roughly thirty-seven at the time of sitting.

Mrs Adeane, is the one on the left, she was Madeline neè Wyndham (1869-1941) and she married Charles R.W. Adean in 1889. He was the Lord Lieutenant of Cambridgeshire. Madeline would have been about thirty.

Mrs. Tennant, sitting on the right and obviously the youngest, was Pamela neè Wyndham (1871-1928). She married Edward Tennant in 1895 and she became Lady Glenconner when her husband took title in 1911. When her husband died in 1920, she married Viscount Grey of Fallodon in 1922. Pamela would have been about twenty-eight at the time of sitting.

(John Singer Sargent, Portraits of the 1890's; Richard Ormond and Elaine Kilmurray; Yale University Press; 2002; pp 155-159)

Sargent would later draw a sketch "mugs" of of some of their children.

Edward Wyndham Tennant 
1915
Son to Pamela -- Mrs. Tennant

Hugo Charteris
Son of Mary -- Lady Elcho

Notes:

• The Metropolitan Museum of Art, NY
• See the year in review 1899