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

William CARD Marriage: 01 Jan 1857, Massachusetts Spouse: Helen M BYINGTON; Birth: 05 Aug 1835 Source: patron submission

Eliza CARD Birth: 30 Jun 1858, New Bedford, Bristol, Massachusetts Father: William CARD; Mother: Helen M BYINGTON Source: patron submission

William P CARD; Birth: 21 Jul 1861, Massachusetts Marriage: 21 Jul 1886, Massachusetts Spouse: Hattie E EASTWOOD Father: William CARD; Mother: Helen M BYINGTON Source: patron submission

Charles Wigeron CARD; Birth: 10 Mar 1867, Forest, Pennsylvania Father: William CARD; Mother: Helen M BYINGTON Source: patron submission

2.  1860 Census Images (online at Ancestry.com; Image #46 of 182):  Stamford P.O., Town of Stamford, Fairfield Co., CT, p. 742, PN 46, 338/378, enumerated 25 Jul 1860, official enumeration date 1 Jun 1860 (extracted by Diana Gale Matthiesen):

William H Card	38	M		House Painter		400	Massachusetts
Helen N	24	F					New York
Eliza O	2	F					Do
Harriet C Byington	21	F					Do
Henry C Pickard	16	M		House Painter			Massachusetts

Harriet is probably Helen's sister.

3.  1870 Census Every-Name-Index/Images (online at Ancestry.com, Image #45 of 59):  Pioneer P.O., Cherrytree Twp., Venango Co., PA, p. 80A, PN 45, 323/334, enumerated 9 Aug 1870, official enumeration date 1 Jun 1870 (extracted by Diana Gale Matthiesen):

Card Wm	45	M	W	Watchman			Mass
"  Mary	38	F	W	Keeping House			"
"  Eliza	13	F	W	At Home			"
"  Wm	8	M	W	"			"
"  Charles	3	M	W				Pa

4.  1880 Census (indexed at FamilySearch.org; page image online at Ancestry.com, Image #30 of 33):  Summit Twp., Butler Co., PA, Roll T9-1109, p. 435B, PN 30, SD 10, ED 53, enumerated 16 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

14

21

24

25

26

186

188

Card W H

W

M

58

/

Pump station

12

MA

MA

MA

"  Hellen M

W

F

44

Wife

/

Keeping house

NY

NY

NY

"  Wm B

W

M

17

Son

/

at Pump station

CT

MA

MA

"  Charles V

W

M

13

Son

/

At home

/

PA

MA

NY

5.  1890 Census:  the 1890 Census Population Schedules were destroyed.

6.  1900 Census Index/Images (online at Genealogy.com, Image #25 of 34 — Myra was indexed "Myra R. Stroup"):  Howe Twp., Forest Co., PA, Roll T623_1412 (Book 1), p. 57A, SN 13, SD 14, ED 49, enumerated 22 Jun 1900, official enumeration date 1 Jun 1900 (extracted by Diana Gale Matthiesen):¤

1900:  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	7	8	9	10	11	12	13	14	15	19	20	22	23	24	25	26	27
236	238	Card Charles C	Head	W	M	Mar 1867	33	*				PA	MA	NY	Day Labor Oil ???	0	Y	Y	Y	O	F	H
		____ Hellen M	Mother	W	F	Aug 1835	64	M	Wd	3	3	NY	VT	NY			Y	Y	Y
		Stroup Myra C	Niece	W	F	Jan 1887	13	S				PA	NY	UN

*a blob.
How could Hellen not know the birthplace of Myra's mother?  Myra's mother was Hellen's daughter!  Presumably, Hellen was not the informant.  Myra was enumerated twice: once here and once with her mother, a few households away.