She had two sisters, Alexandra (Mrs. Benjamin Moore and Mrs. Robert Gordon McKay) and Lela (Mrs. Alastair Mackintosh and Duchess of Talleyrand), and two brothers, Thomas Emery and John Josiah Emery, Jr. (who married Irene Gibson Post, the daughter of the artist Charles Dana Gibson).
Morse also gained fame as the model for a famous drawing by Charles Dana Gibson titled "The Halfback." In the 1890s, Gibson asked the handsome blond Morse to pose for him.
She was the youngest sister of Nancy Astor, Viscountess Astor and of Irene Langhorne, who was married to the artist Charles Dana Gibson.
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