1.  Marriage Record:

2.  1840

3.  1850 Census Index/Images (online at Ancestry.com; Image #12-13 of 32 — mis-indexed "Mack"):  Richland Twp., Cambria Co., PA, pp. 147B-148A, 87/93, enumerated 7 Nov 1850, official enumeration date 1 Jun 1850 (extracted by Diana Gale Matthiesen):

John Mock	51	M		Farmer		Pa
Catherine	42	F				"
[next page]
John Mock	20	M		Laborer		Pa
Moses   "	18	M		"		"
Tobias  "	15	M				"
Ann     "	12	F				"
George  "	9	M				"
Mary    "	6	F				"
Maria    "	3	F				"
Elizabeth "	1	F				"

4.  1860 Census Index/Images (online at Ancestry.com, Image #361 of 684):  Scalp Level P.O., Paint Twp., Somerset Co., PA, Roll M653_1183, p. 356, PN 193, 1323/1326, enumerated 31 Jul 1860, official enumeration date 1 Jun 1860 (extracted by Diana Gale Matthiesen):

John B. Mauck	61	M		Farmer	800	300	Pennsylvania
Catharine "	51	F					"
Anna      "	23	F					"
George    "	18	M					"
Margaret  "	17	F					"
Maria     "	14	F					"
Catharine "	8	F					"

Listed next to son, John C. MAUCK (æ 30, b. PA, wife Lydia). 

5.  1870 Census Every-Name-Index/Images (online at Ancestry.com):  can't find, and I even did pages-by-page searches of Stoystown, Quemahoning Twp., and Paint Twp.  I can't find Gottlieb & Maria (MAUCK) STRAUB, either.  The enumerator must have missed a section of the township. 

6.  1880 Census (indexed at FamilySearch.org; page image online at Ancestry.com, Image #26 of 27):  Paint Twp., Somerset Co., PA, Roll T9-1195 (Book 1), p. 410B, PN 26, SD 8, ED 18, enumerated 24 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

11

13

14

23

24

25

26

201

215

Straub Gottlaeb

W

M

35

/

Farmer

Ger

Ger

Ger

______ Maria

W

F

34

Wife

/

Keeping House

PA

PA

PA

[Gottlieb & Maria's children]

Mock John

W

M

81

father

/

No Occupation

Sickly

PA

PA

PA

____ George

W

M

38

Son

/

Laborer

/

PA

PA

PA

____ Ann

W

F

40

Dau

/

At home

/

PA

PA

PA

7.  Tombstone Readings:  Lutheran Cemetery, Paint Borough, Paint Township, Somerset Co., PA (online at the Somerset County PAGenWeb site; contributed by Donna Knupp):

Mock, John C. Private  Co H. 171st  Reg. Pa. Vol. Died July 17, 1892 Aged 74 yr.

If this is our subject's son, some "age inflation" has taken place because John would be ca. 62, not 74, in 1892 — either that or the stone has been mis-read.  

8.  Messages in the Somerset County, Pennsylvania, Forum (online at GenForum.com), including one that confirms John C. MOCK died in 1902, not 1892.