"Nymphas" is a scriptural name (shortened form of the Greek name, Nymphodorus); "Jedidah" is also scriptural; "Nymphus" and "Jedida" are misspellings ("Jedidiah" is simply the wrong name).

If Thankful is the daughter of Benjamin & Philadelphia, then she was born in Bolton, Worcester Co., MA.

— born in Jackson Twp., Highland Co., OH:
  3.  Sylvester BASSETT, b. 24 Mar 1814; d. 23 Feb 1902, Shelby Co., IN
  4.  Samuel BASSETT, b. 1815; d. 20 Jul 1864
  5.  Jeremiah O. BASSETT, b. 1818; d. May 1865, Shelby Co., IN
  6.  Nymphas BASSETT, b. 1821/2; d. 10 Jul 1880
  7.  Hannah BASSETT, b. 1822/3; d. 3 Mar 1863, Bridgeport, IN

— born in Shelby Twp., Shelby Co., IN :
  8.  Oliver Clemens BASSETT, b. 1825 or Aug 1824?; d. Jul 1906
  9.  Olive BASSETT, b. 1828; d. 1866
10.  Rufus BASSETT, b. 1830; d. 24 Jan 1886, Terre Haute, Vigo Co., IN

1.  Marriage Record:

2.  1810 Census Index/Images (online at Ancestry.com, Image #2 of 4 — indexed "Bassil"; extracted by Diana Gale Matthiesen):

1810

NY

Essex Co.

Jay

Roll 27

p. 18

Ln. 21

Nymphes Basset

00100-30100-00

These data indicate:

No. & Sex	Age Class	Therefore Born	Individuals Inferred
0 males	9 or under	1800-1810	= where's Bernard?
1 male	16-25	1784-1794	= Nymphas (b. 1784)
3 females	9 or under	1800-1810	= Daughter? = Daughter? = Daughter?
1 female	16-25	1784-1794	= Thankful (b. 1787/8)

Either Thankful married very young, was fibbing about her age, or Nymphas had a prior wife.  Whatever… who are the three girls?  Or is this just a gross enumerator error?  I would suspect this is not our subject, except that, beyond the extreme rarity of his name, he is listed one line below his father, Rufus BASSET (æ 45+).  Was Bernard missed, or was he born in 1810, not 1809?

3a.  1820 Census Index/Images (online at Ancestry.com, Image #3 of 3 — indexed "Nymphas Batsell" and mis-labeled as being in Fayette County; extracted by Diana Gale Matthiesen):

1820

OH

Fayette [actually Highland] Co.

Jackson Twp.

Roll M33_92 (Part 1)

p. 29

Ln. 8

Nymphas Bassett

410010-00100-0-000

These data indicate:

No. & Sex	Age Class	Therefore Born	Individuals Inferred
4 males	9 or under	1810-1820	= Jeremiah (b. 1818) = Samuel (b. 1815) = Sylvester (b. 1814) = Jonah (b. 1811)
1 male	10-15	1804-1810	= Bernard (b. 1809)
1 male	26-44	1775-1794	= Nymphas (b. 1784)
1 female	16-25	1794-1804	= Thankful (b. 1787/8)
1	person engaged in agriculture

3b.  1830 Census Index/Images (online at Genealogy.com):  the images here are correctly placed in Highland County.

4.  1830 Census Index/Images (online at Ancestry.com, Image #3 of 10 — indexed "Nenphew Bassell"; list was roughly alphabetized; extracted by Diana Gale Matthiesen):

1830

IN

Shelby Co.

Shelby Twp.

Roll 28

p. 380

Ln. 7

Bassett Nymphas

211 200 100 - 200 000 100

These data indicate:

No. & Sex	Age Class	Therefore Born	Individuals Inferred
2 males	4 or under	1825-1830	= Rufus (b. 1830) = Oliver (b. 1825)
1 male	5-9	1820-1825	= Nymphus (b. 1821)
1 male	10-14	1815-1820	= Jeremiah (b. 1818)
2 males	15-19	1810-1815	= Samuel (b. 1815) = Sylvester (b. 1814)
1 male	40-49	1780-1790	= Nymphas (b. 1784)
2 females	4 or under	1825-1830	= Olive (b. 1828) = Hannah (b. 1822/3?)
1 female	40-49	1780-1790	= Thankful (b. 1787/8)

Where's Jonah?  Also in Shelby Township: Barneby BASSETT (00001-00001).

5.  1840 Census Index/Images (online at Ancestry.com, Image #7 of 10; extracted by Diana Gale Matthiesen):

1840

IN

Shelby Co.

Marion Twp.

Roll 93

pp. 322B-323A

Ln. 6

Nymphas Basset

110 200 100 - 001 100 100

0300000

These data indicate:

No. & Sex	Age Class	Therefore Born	Individuals Inferred
1 male	4 or under	1835-1840	= Nymphus W? (b. 1835/6)
1 male	5-9	1830-1835	= Rufus (b. 1830)
2 males	15-19	1820-1825	= Oliver (b. 1825) = Nymphus (b. 1821)
1 male	40-49	1790-1800	= Nymphas (b. 1784)
1 female	10-14	1825-1830	= Olive (b. 1828)
1 female	15-19	1820-1825	= Hannah (b. 1822/3)
1 female	40-49	1790-1800	= Thankful (b. 1787/8)
3	person employed in agriculture

Listed one line below Samuel BASSET, who is one line below Sylvester BASSET; listed one line above Jonah BASSET, who is two lines above Bernard H. BASSET.  Where's Jeremiah?

6a.  1850 Census Every-Name-Index/Images (online at Ancestry.com, Image #5 of 20):  Marion Twp., Shelby Co., IN, Roll M432_172, p. 386A, 34/34, enumerated 11 Sep 1850, official enumeration date 1 Jun 1850 (extracted by Diana Gale Matthiesen):

Nymphus Bassett	66	M		Farmer	5000	Vt
Thankful   "	62	F				Mass
Nymphus    "	29	M				Ohio
Rufus      "	20	M				Ind
Nymphus W	14	M				"

6b.  1850 Census Every-Name-Index/Images (online at Ancestry.com):  Oliver BASSETT (æ 24, b. IN) is living in Marion Twp., Shelby Co., IN (p. 385A), with his wife, Elisabeth (æ 18, b. 18); they are listed two households form Oliver's married sister, Hannah (BASSETT) KELLY (æ 27, b. OH), her husband, Jonathan KELLY (æ 21, b. OH), and his presumed father, Benjamin KELLY (æ 65, b. VA).  Samuel BASSETT (æ 35, b. __) is on the next page, living with his wife, Permelia (æ 37, b. IN).

7.  1860 Census Every-Name-Index/Images (online at Ancestry.com):  Nymphus BASSETT (æ 76, b. VT) is living in Marion Twp., Shelby Co., IN (p. 714), with his married daughter, Olive (BASSETT) ELLIS (æ 32, b. IN).  They are listed next to Nymphus BASSETT (æ 38, b. OH) and his family, who are next to Rufus BASSETT (æ 28, b. IN) and his family.  In the other direction, the ELLIS's are next to Oliver BASSETT (æ 35, b. IN) and his family.  On the next page is Sylvester BASSETT (æ 47, b. OH) and his family.  Jonah BASSETT (æ 45, b. NY) is living in Addison Twp., Shelby Co., IN (p. 664), with his wife and family.

8.  1870 Census Every-Name-Index/Images (online at Ancestry.com):  can't find Nymphas, and I really looked, including a page-by-page check of Marion Twp., Shelby Co., IN.  Jonah BASSETT (æ 59, b. NY) is living in Marion Twp., Shelby Co., IN (p. 273A) with his wife and family.  Bernard BASSETT (æ 62, b. NY) is living with his wife and family in Vacaville Twp., Solano Co., CA (p. 127B).  Oliver BASSETT (æ 43, b. IN) is also in Marion Twp. (p. 239A) living with his wife and family and listed two households from his brother, Sylvester BASSETT (æ 58, b. OH) and his wife and family; on the next page is Nympheus BASSETT (æ 50, b. OH) with his wife and family.  Plus other, younger BASSETT families from the next generation.

9.  Anon.  Thursday, 1 Jan 1874.  "Obituary: A Pioneer Gone."  The Shelbyville Weekly Volunteer (Shelbyville, IN), p. 3 (online at the Shelby County INGenWeb site; submitted by Barb Huff):

Mr. Nymphus Bassett, one of the pioneers of Shelby county, died in Taney county, Missouri, October 16, 1873, at the great age of 97 years.  Mr. Bassett settled in this county in the spring of 1824, and remained a resident here until about one month previous to his death, when he left these parts for the express purpose, as he said when going, to settle again in a new country, having grown tired of his conventionalites of life in a thickly settled community.  He was the father of ten children, grandfather of sixty-one children and great grand father of eighty five children.  Thus the life light of another of the early lights that helped to light up the way of civilization in these once Western wilds, has gone out-blotting out a number of early reminiscences.  So they go.

He would have been 89, not 97.

10.  James M. Bassett, William H. Bassett, & John R. Bassett.  1912.  History of Nymphas Bassett's Family: Reunion at Shelby County Fair Grounds, Shelbyville, Indiana, July 18, 1912.  Self-publ.  (selections kindly provided by Jeff N. Bassett).  Thankful is given middle name, Ann.

11.  WorldConnect / Ancestry World Trees (online at RootsWeb.com/Ancestry.com).

11.  Messages posted to the Bassett Family Genealogy Forum (online at GenForum.com).

13.  Email from Jeff N. Bassett:  the Anna BASSETT (1791-1865) buried in Shelby Co., IN, is not the wife of our subject; she's Anna (nee PARKER), second wife of John BASSETT (1778/9-1834).  Thankful died in 1856, while Nymphas was making a visit to New York.