Osborn, Fish, Livingston, Cornish, Mills, and others increasingly proliferated throughout the Hudson Valley and surrounding Hudson Highlands. Sloan was noted for having been deeply devout, and one son-in-law, Joseph Rankin Duryee, was a prominent minister in New York City during the last quarter of the 19th century and first quarter of the 20th. From 1879 through 1920 he served as pastor of what was initially called the Seventh Avenue Chapel of the Dutch Collegiate Reformed Church, located at the corner of Seventh Avenue and 54th Street. It later became independent and was renamed the Grace Reformed Church, with Duryee continuing as its pastor (The Century Association Biographical Archives Foundation, entry for Joseph R. Duryee;see also, "A Daytonian in Manhattan," May 7, 2018, "The Lost Grace Reformed Church"). In 1927 Duryee wrote and published a 175-page-long biography of Sloan and his wife, Margaret Elmendorf Sloan, covering their lives and family, time in the Hudson Valley, and Sloan's business career (Duryee, Joseph Rankin: The Story of Samuel and Margaret Sloan; Published Privately for Family Circulation Only, 1927, 100 copies; reprinted, 2013, ISHI Press International). The biography states that, because of the deaths of two of their children in 1861, the Sloans began looking for a location where they could build a summer estate outside of New York City. It was common at the time to believe that summering outside of crowded metropolitan areas improved health generally and particularly for children. The Sloans began buying land in Garrison during the Civil War and, according to the Duryee biography, were encouraged to do so by Governor Hamilton Fish and also by William H. Osborn, both of whom had recently built extensive summer estates in Garrison. The Sloans built their own Garrison summer estate, Oulagisket (later renamed Lisburne Grange by his son) in 1864, immediately adjacent to the Osborn estate.Sloan and his wife built the Walker House near Oulagisket and adjacent to Wyndune in 1885. It was originally occupied by their son, William, but was given to their daughter, Elizabeth La Grange Sloan (1862 - 1960), and her husband, Joseph Walker, Jr.(1858-1927). The Walkers had been married on April 27, 1887, at the South Reformed Church on Fifth Avenue. In its report of the wedding, the next day's New York Times described it in the headline as "FIFTH AVENUE THE SCENE OF AN UNUSUALLY BRILLIANT WEDDING." Guests included the recently elected reform mayor of New