He has an amazing article by the New England Historical Society The Greely Expedition Plants the Flag ‘Farthest North’ a great read for us History Seekers!
Wikipedia
His daughter is a notable also see Rose Rose Ishbel Greely (1887 - 1969) however it appears she never married and had no children.
His son was a Brigadier General see John Nesmith Greely (1885 - 1965) served in WWII
Amazing Family and the Socialites of their Era!