1.  Marriage Record:

2.  1850 Census Every-Name-Index/Images (online at Ancestry.com, Image #34 of 49):  Jackson Twp., Northumberland Co., PA, Roll M432_804, p. 232B, 221/221, enumerated 13 Nov 1850, official enumeration date 1 Jun 1850 (extracted by Diana Gale Matthiesen):

William Shafer	30	M		Farmer		Pa
Maria     "	32	F				Pa
Cathrine  "	7	F				Pa
Michael   "	5	M				Pa
Moses     "	4	M				Pa
Isaac     "	3	M				Pa
Louisa    "	1	F				Pa
Jeremiah Kappenhafer	12	M				Pa

Listed next to William's parents, Michael SHAFER (æ 67, b. PA) and wife Elizabeth (æ 62, b. PA).

3.  1860 Census Every-Name-Index/Images (online at Ancestry.com, Image #3 of 24):  Reabuck P.O., Jordan Twp., Northumberland Co., PA, Roll M653_1149, p. 236, PN 25, 171/171, enumerated 7 Jul 1860, official enumeration date 1 Jun 1860 (extracted by Diana Gale Matthiesen):

William Shaffer	36	M		Farmer	3000	1400	Penna
Polly       "	35	F					"
Catherine   "	18	F					"
Mary        "	9	F					"
Louisa      "	11	F					"
Jane        "	4	F					"
Michael     "	15	M		farm hand			"
Moses       "	13	M					"
Isaac       "	12	M					"
Aaron       "	8	M					"
William     "	2	M					"
Elizabeth Shaffer	75	F					"

This enumerator did, in general, put the children in chronological order, so I've no explanation for the ordering of the children here beyond, "ladies first."  Elizabeh is presumably William's widowed mother.

4.  1870 Census Index/Images (online at Genealogy.com, Image #1 of 24):  Paxinos P.O., Jordan Twp., Northumberland Co., PA, Roll M593_1384, p. 206A, PN 1, 6/7, enumerated 18 Aug 1870, official enumeration date 1 Jun 1870 (extracted by Diana Gale Matthiesen):

Shafer William	51	M	W	Farmer	2500	1500	Pennsylvania
______ Mary	53	F	W	Keepg House			"
______ Moses	23	M	W	Labr			"
______ Louisa	21	F	W				"	Jan
______ Mary	18	F	W				"
______ Aaron	15	M	W				"
______ Jane	12	F	W				"

5.  1880 Census Every-Name-Index/Images (online at Ancestry.com, Image #9-10 of 20):  Jordan Twp., Northumberland Co., PA, Roll T9_1164, pp. 231A-231B, PN 9-10, SD 3, ED 152, enumerated 11 Jun 1880, official enumeration date 1 Jun 1880 (extracted by Diana Gale Matthiesen):

1880:  for an explanation of the column headings, please see What the Numbers in the Federal Census Mean (missing columns contained no data).

1

2

3

4

5

6

8

9

10

13

15

21

23

24

25

26

78

90

Shaffer William T

W

M

60

/

Farmer

PA

PA

PA

_______ Polley

W

F

64

Wife

/

Keeping house

Typhoid fever

/

PA

PA

PA

_______ Mary

W

F

27

Dau

/

At home

PA

PA

PA

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_______ Aaron

W

M

25

Son

/

Farm Laborer

PA

PA

PA

Schwartz John

W

M

17

Border

/

Laborer

/

PA

PA

PA

Stroup Henry

W

M

26

Border

/

Laborer

PA

PA

PA