1.  Marriage Record:

2.  Family Quest Archives:  New York Federal Census 1840:  Niagara County.  Heritage Quest CD M704-311:

1840

NY

Niagara Co.

Somerset

p. 152A

Joshua Huntington

011 010 - 200 010

These data indicate:

No. & Sex	Age Class	Therefore Born	Individuals Inferred
1 male	5-9	1830-1835	= David (b. 1834/5)
1 male	10-14	1825-1830	= ?
1 male	20-29	1810-1820	= Joshua (b. 1811/2)
2 females	4 or under	1835-1840	= Evalina (b. 1837/8) = Daughter A
1 female	20-29	1810-1820	= Rebecca (b. 1815/6)

The teenage boy is a bit old to be their son, unless Rebecca was fibbing about her age in 1850, which is certainly possible.

3.  Family Quest Archives:  New York Federal Census 1850: Niagara County (part).  Heritage Quest CD M432-561:  Somerset, Niagara Co., NY, p. 348AB, 52/52, enumerated 9 Jul 1850 (extracted by Diana Gale Matthiesen):

Joshua Huntington	38	M	Farmer	3150	NY
Rebeca     "	34	F			"
David      "	15	M			"
Evalina    "	12	F			"
Sarah      "	8	F			"
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Mathew Huntington	6/12	M			NY
Emily      "	3	F			"

Rebecca may be fibbing about her age.  Living eight doors down from probable father, Gurdon HUNTINGTON.

2.  Huntington Database (online at the Huntington Family Association).

3.  Messages in the Huntington Family Genealogy Forum (online at GenForum.com).