As I told Audrey, it is only a supposition that the Samuel Daggett who married Adelia Fielder is the son of Jacob Daggett Jr.
The Samuel Bradlee Doggett book has the decendency as far as Jacob Sr. William of Saco Ebenezer Samuel Jacob Sr (nothing further on Jacob in this book) My copy of this book was released in 1973 and William of Saco begins on page 565.
However here is a supplement to this book called "Supplements to Thomas Doggett of Marshfield and William Daggett of Saco" by George H. and Sydney B. Daggett. My copy was published in 1975.
In the supplement George and Sydney continue the line of William of Saco as follows William Ebenezer Samuel Jacob Jacob Jr Samuel (supposition)
Here is what it says EXACTLY in this book (page 19, section William Daggett of Saco, Maine) 5655-1 JACOB DAGGETT JR (5) b abr 1780 NH, m Elizabeth, b 1788 NH.Find him first in Ontario Co. NY 1810 census with his father Jacob Daggett on pg 179- Jacob Jr, 1 male 16-26; 1 female 16-26; 1 male under 10;1 female under 10;
1820 census Cro. Twp Hamilton Co, Ohio, Jacob Jr;1 male 26-45; 1 female 26-45; 1 male 10-16; 1 female 10-16; 2 males under 10; 2 females under 10
1835 Madison Co Ill. Deed 3/26/1834 and book 11-560 Rhia land in SE 1/4 Ne 1/4-Sec14,T3 N R 9 W; 10/20/1834 Samuel Daggett and John Grott buys NE 1/4 of SE 1/4 Sec 11 T 3 N R 9 W.A Samuel Daggett married Adelia Fielder in Vermillion Co; Ill (but does not appear in the 1830 census of that county- so evidently has moved on) 1832 Samuel Daggett is joined ina deed by his wife Adelia issue (of Jacob Jr) 5655-11 Male (Samuel?)(6) b 1800-1810 5655-12 Female (6)b1800-1810 5655-13 Male (Truman?) (6) b 1810-1820 Madison Co Ill census 1850 5655-14 John Franklin (6) b Dec 4 1816 1810-1820, Hamilton Co Ohio 5655-15 Female (6) 1810-1820 5655-17 Calista (6) b 1820/21 marries Edwin Edwards. Lived in Pike Co Ill 1850 census 5655-16 Female (6) b 1810-1820
5655-1 (Supposition) Samuel Daggett (6) b 1809 NY (obit 1850) d 1850 (Listed in 1850 Obit, Independence Co Ark) 41 Yrs;m 10 Apr 1830, Vermillion Co Ill to Adelia Fielder, b 1812? Ind, dau of Annriell(?) Fielder
In the suplement, the author gives the date of Jacob SR.'s birth as May 30 1766, Sutton MA but points out that his Pension record says 15 May 1759
Again I stress that this is the author's supposition (not mine) regarding Samuel.
You might be interested to know that there is a third book called "A Supplement to John Doggett/Daggett of Martha's Vineyard" by the same authors.