1.  Marriage Record:

2.  1850 Census Index/Images (online at Ancestry.com; Image #36 of 37):  West Twp., Huntingdon Co., PA, p. 93B, 264/267, enumerated 11 Sep 1850, official enumeration date 1 Jun 1850 (extracted by Diana Gale Matthiesen):

Henry Steel	26	M		Farmer		Penna
Sarah     "	32	F				"
John      "	2	M				"
Christain "	9/12	M				"
John Corban	40	M		Laborer		"
John Steel	60	M		Farmer	500	"
Elizabeth "	50	F				"
[John & Elizabeth's other children]

John CORBIN is Sarah's brother.  John & Elizabeth STEEL are Henry's parents.  Listed next door to William HIGHT, who is two doors down from Sarah's uncle, Micajah CORBIN. 

3.  1860 Census Images (online at Ancestry.com; Image #4 of 16):  Henderson Twp., Huntingdon Co., p. 256, PN 4, 25/25, enumerated 6 Jun 1860, official enumeration date 1 Jun 1860 (extracted by Diana Gale Matthiesen):

Henry Steel	40	M		Farmer	175	200	Penna
Sarah     "	40	F					"
John       "	12	M					"
Christian C "	10	M					"
Hannah M    "	9	F					"
Lydia Corbin	84	F					"

Lydia is Sarah's mother.

4.  1870 Census Images (online at Ancestry.com; Image #10 of 18):  Huntingdon P.O., Henderson Twp., Huntingdon Co., PA, p. 612B, PN 10, 65/70, enumerated 18 Aug 1870, official enumeration date 1 Jun 1870 (extracted by Diana Gale Matthiesen):

Steel Henry	47	M	W	Farmer	1000	1000	Penna
_____ Sarah	54	F	W	Keeping house			Do
_____ Taylor	20	M	W	Working on farm			Do
_____ Susan	27	F	W	At home			Do
_____ Miranda M?	2	F	W				Do
Corbin Lydia	98	F	W	Living w family			Do

Lydia is Sarah's mother.  Taylor and Susan were not in previous censuses with our subjects, so cannot be their children.  Secondary sources show Miranda as Henry & Sarah's child, but Sarah is too old to be her mother.  Miranda's mother is probably Susan, who is probably a widow.

5.  1880 United States Census and National Index (LDS Family History Resource File: CD-ROM Library):

Census Place: Henderson, Huntingdon, Pennsylvania
Source: FHL Film 1255134; NARA Film T9-1134; Pg 131A
	Relation	Sex	Marr	Race	Age	Birthplace	Occupation	Fa	Mo
Henry STEEL	Self	M	M	W	57	PA	Farmer	PA	PA
Mary J. STEEL	Wife	F	M	W	34	PA		PA	PA
Clara STEEL	Dau	F	S	W	8	PA		PA	PA
Charles S. STEEL	Son	M	S	W	6	PA		PA	PA
Samuel STEEL	Son	M	S	W	4	PA		PA	PA
Toner STEEL	Son	M	S	W	1	PA		PA	PA