In tracing the Coffin line, Cutter shows the following line:
1. Tristram Coffin (b. ~1605) & Dionis Stevens
  2. Peter Coffin (b. ~1631) & Abigail Starbuck
    3. Jethro Coffin (b. 1663) & Mary Gardner
      4. John Coffin (b. 1694) & Lydia Gardner
        5. John Coffin (b. ~1720, removed to Fishkill, NY ~1740) & Mary Davis
          6. Edward Coffin (b. 1762 in Fishkill, NY) & Sibyl
          6. Isaac Coffin
          6. John Coffin

The following is from "The Coffin Family", edited by Louis Coffin, 1962.

Page 126
EDWARD COFFIN s of John & Mary 4 (name may be Tristram) md
b. 1762
Married Sylvia               Edward b. at Fishkill, N.Y.
5    Isaac, James, Joseph, Ann, John, Abraham, Edward J., &
Benjamin

Page 124

born
JOHN COFFIN s of John and Lydia 1 md- (founded Barrington, N.S.) c 1720
Mary Davis dr of John & Margaret
Seth md Annie Barlow 2.18.1768
John 12.31.1752
Mary 10.23.1754
Margaret 6.23.1756
Peter md Esther Doane 10.12.1758
Lydia 10.3.1760
Tristram 6.3.1762
Zebulon 4.4.1764
Mary 12.25.1766
Josiah 10.8.1770
(Edward Coffin s of John Coffin & Mary Davis       b. Fishkill, N.Y. 1762
Coffin is not mentioned above unless same person as Tristram)

Carol J. Hayward (submission number 83354-0710100221205) and Therese Koehler (submission number 915204-0626100212202) also show this connection in their pedigree resource files available at familysearch.org. Therese also shows this line in Rootsweb Worldconnect here. She also shows that Edward and Sibyl were married around 1790, but the 1790 census shows Edward with 4 males under 16 years of age, presumably his children. Cutter's shows his firstborn Isaac to have been born in 1784.
Ross B. Kenzie, in his descendants of Thomas Gardner, lists John Jr. and Peter (1758 - 1824) as the children of John and Mary Coffin, but does not mention the other children.

There is some very interesting information (linked here), from Volume XII, Number 4, Nov 1996 edition of Coffin Family Newsletter, posted to Rootsweb WorldConnect by Gary Silverstein. It appears to be well researched information, showing that John Coffin was born 14 Aug 1727 and married Mary Davis 16 Mar 1751/52. In 1761 John Coffin moved from Nantucket to Barrington, Nova Scotia, having already had 5 children. He had a son Tristram on 3 Jun 1762 in Nova Scotia. Different entries in the International Genealogical Index on familysearch.org show a son born to John and Mary Coffin on 3 Jun 1762 named "Tristram Coffin", "Tristram Edward Coffin", "Tristram OR Edward Coffin", and being born either in Barrington, Nova Scotia, Nantucket, MA or Fishkill, NY. So the question remains, if this is our Edward Coffin, where was he born, and/or how and when did he get from Barrington, Nova Scotia to Fishkill, NY?