1.  Lorraine Cook White, ed. 1994-2002.  The Barbour Collection of Connecticut Town Vital Records.  55 vols.  Genealogical Publ. Co., Baltimore, MD (online at Ancestry.com):

p. 82	HYATT, HAYT, Daniel, m. Hannah P. SHERMAN, b. of Bethel,
p. 83	[The image of page 83 is missing, at least as of 21 Oct 2007.]
p. 121	SHERMAN... Hannah P., m. Daniel HYATT, b. of Bethel, Apr. 19, 1840,
p. 122	by John Greenwood | Vol. 3 | Page 103

2.  LDS.  Family Search: Internet Genealogy Service:  IGI - International Genealogical Index (online at FamilySearch.org).

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Daniel HYATT Birth: About 1792, of Bridgewater, Litchfield, Connecticut Marriage: About 1817, of Bridgewater, Litchfield, Connecticut Spouse: Irene HAMLIN Birth: 1796, Bridgewater, Litchfield, Connecticut Death: 1838, Danbury, Fairfield, Connecticut Source: patron submission

Daniel HYATT Birth: About 1793, of Kinderhook, Columbia, New York Marriage: About 1819, of Kinderhook, Columbia, New York Spouse: Irene HAMLIN Birth: 1796, of Kinderhook, Columbia, New York Death: 1838, Danbury, Fairfield, Connecticut Source: patron submission

Daniel HYATT Birth: About 1791, Connecticut Marriage: About 1820, Connecticut Spouse: Irene HAMLIN Birth: 1796, of Southington, Hartford, Connecticut Death: 1838 Source: patron submission

Daniel HYATT Birth: About 1815, Bethel, Fairfield, Connecticut Marriage: 19 Apr 1840, Bethel, Fairfield, Connecticut Spouse: Hannah SHERMAN Birth: About 1819, Bethel, Fairfield, Connecticut Source: patron submissions

Alfred Hamlin HYATT Birth: 17 May 1821, Kinderhook, Columbia, New York Father: Daniel HYATT; Mother: Irene HAMLIN Source: patron submission

Alfred H. HYATT Birth: 17 May 1821, of Danbury, Fairfield, Connecticut Father: Daniel HYATT; Mother: Irene HAMBLIN Marriage: 13 May 1844 Spouse: Mariette KEELER Source: patron submission

Edward F. HYATT Birth: 12 Jul 1846, Danbury, Fairfield, Connecticut; Death: 1866 Father: Daniel HYATT; Mother: Irene HAMBLIN Source: patron submission

.  1830 Census Index/Images (online at Ancestry.com, Image #11 of 60; extracted by Diana Gale Matthiesen):

1830

CT

Fairfield Co.

Danbury

Roll 6

p. 101/200

Ln. 2

Danl Hyatt

020 001 - 200 001

These data indicate:

No. & Sex	Age Class	Therefore Born	Individuals Inferred
2 males	5-9	1820-1825	= Son A = Alfred (b. 1821)
1 male	30-39	1790-1800	= Daniel (b. 1793/4)
2 females	4 or under	1825-1830	= Daughter B = Daughter A
1 female	30-39	1790-1800	= Irene

He's the only HYATT in Danbury.

.  1840 Census Index/Images (online at Ancestry.com):  There is a Danl. HYATT in Danbury, Fairfield Co., CT (p. 512, Line 9; 000 000 100 - 011 101 000), and he's the only Daniel HYATT in Fairfield County.

.  1850 Census Every-Name-Index/Images (online at Ancestry.com, Image #34 of 142):  Danbury, Fairfield Co., CT, Roll M432_37, p. 99B, 236/276, enumerated 3 Aug 1850, official enumeration date 1 Jun 1850 (extracted by Diana Gale Matthiesen):

Daniel Hyatt	56	M		Hatter		Ct
Hannah     "	43	F				"
Louisa M   "	8	F				"
Cordelia M "	6	F				"
William F  "	4	M				"
Francis    "	2	F				"