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Mary McElroy (née Arthur; July 5, 1841 – January 8, 1917) was an American woman known as being the sister of the 21st president of the United States, Chester A. Arthur, for whom she served as a hostess (acting as the first lady) for his administration (1881–1885). She assumed the role because Arthur's wife, Ellen, had died nearly two years earlier. McElroy was born in New York and attended the progressive Emma Willard School. Wikipedia