, 1903 On December 13, 1859, Endicott was married to Ellen Peabody (1833–1927) in Salem. Ellen was the daughter of philanthropist George Peabody and Clarissa Peabody of Salem. Her grandfather was the distinguished Salem ship owner,
Joseph Peabody, who made a fortune importing pepper from Sumatra and was one of the wealthiest men in the United States at the time of his death in 1900. Together, William and Ellen had two children: • William Crowninshield Endicott Jr. (1860–1936), a lawyer who married Marie Louise Thoron (1864–1958), daughter of Joseph Thoron and Anna Barker (née Ward) Thoron, in 1889. William C. Endicott Jr. was the president of the
Massachusetts Historical Society for ten years. • Mary Crowninshield Endicott (1864–1957), who married the British statesman
Joseph Chamberlain in 1888. After his death, she married the Anglican clergyman William Hartley Carnegie (1859–1936), in 1916. Endicott died of acute pneumonia in
Boston, Massachusetts on May 6, 1900. His wife lived another twenty-seven years, until her death in Boston on August 20, 1927, after which she was buried with William in the Endicott Lot at
Harmony Grove Cemetery in Salem. ==References==