From "Glen Cove - Images of America" (by Joan Harrison, 2008); Isaac Coles was born in 1817 when Glen Cove was still known as Musketa Cove, and he remained there until his death in 1897 at age 90. Mary G Willets was born in 1822 into a long-established family in Hempstead. They had five children (in reverse order): Oscar L (1865-1937; +Anne W), Franklin A (1861-1943; +Carolyn Reed), Isaac R (1858-1937; +Frances S Cocks). Mary A (1855-1858, age 2), and Thomas Hewlett (1861-1896; +Sallie Emma Pancoast), my great grandfather. Isaac's and Mary's mortal remains are interred in the Matinecock Friends burial ground in Locust Valley.
From longislandgenealogy.com, 'Death Reported by the Long Islander, 1894-1900': COLES Isaac, 80 years; d. 2 November 1897 at Glen Cove; funeral at Friends Meetinghouse, Locust Valley; husband of Mary Willetts; son-in-law of Richard Willetts; father of Oscar L. Coles of New York City and Isaac R. Coles and Franklin A. Coles, both of Glen Cove; native of Glen Cove area, born in 1817; member of the Society of Friends; surveyor; at one time a member of the New York State Assembly"
"COLES Mary W., 74 years; d. 14 June 1895 at Glen Cove; funeral Friends Meetinghouse, Matinecock; daughter of James [sic] Willets; wife of Isaac Coles; mother of four unnamed sons; Been sick for several years; member of Friends Society at Matinecock"
The period of 1895 to 1897 was a particularly rough one for the Coles Clan. Matriarch Mary passed in Jun-1895, Oscar's new bride (of less than two years) Grace Anita (Schenck) died in May-1896, Thomas died "of a long illness" in Aug-1896, and patriarch Isaac passed in Nov-1897.
Isaac ColesMary Willets