Many secondary sources name our subject's youngest son, "Jacque Wible LYON."  It appears to me this is a mis-interpretation of his name as enumerated in the 1910 census (see below) because I have yet to find his name as anything other than John or "Jack" (the nickname of John) in any other primary record.  If someone has such a record, please share.

1.  Marriage Record:

2.  1860 Census Every-Name-Index/Images (online at Ancestry.com):  Milton LYON (æ 7, b. PA) is living in Duquesne Borough, Allegheny Co., PA, with his parents (q.v.).  Charlotte WYBLE (æ 4, b. PA) is living in Shaler Twp., Allegheny Co., PA (p. 171A), with her parents, Harris WYBLE (æ 42, b. PA) & Rachel (æ 40, b. IRL), plus siblings.

3.  1870 Census Every-Name-Index/Images (online at Ancestry.com):  M.W. LYON (æ 17, b. PA; teacher) is living in Millvale Borough, Allegheny Co., PA, with his parents (q.v.).  Charlotta WIBLE (æ 13, b. PA) is living in Shaler Twp., Allegheny Co., PA (p. 423A), with her parents, Harrison WIBLE (æ 52, b. PA) & Rachel (æ 48, b. PA), plus siblings.

4.  1880 Census Every-Name-Index/Images (online at Ancestry.com, Image #30 of 37):  Millvale Borough, Allegheny Co., PA, Roll 1088, p. 330B, PN 30, SD 9, ED 39, enumerated 19 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	24	25	26
248	289	Lyon Walter	W	M	27			/	Attorney at Law	PA	PA	PA
		____ Lotta	W	F	23	Wife		/	Keeping house	PA	PA	IRL
		____ Lotta	W	F	1	Dau	/			PA	PA	PA

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

6.  1900 Census Every-Name-Index/Images (online at Ancestry.com, Image #22 of 42):  1133 Sheffield [Street], Allegheny City [now Pittsburgh] (Ward 5), Allegheny Co., PA, Roll T623_1356 (Book 1), p. 25A, SN 8, SD 18, ED 51, enumerated 9 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

21

22

23

24

25

26

27

*

1133

132

156

Lyon Walter

Head

W

M

Apl 1853

47

M

22

PA

PA

PA

Attorney

0

Y

Y

Y

O

F

H

____ Charlotte

Wife

W

F

Feb 1857

43

M

22

6

6

PA

PA

IRL

Y

Y

Y

____ Lotta

Dau

W

F

Mar 1879

21

S

PA

PA

PA

Y

Y

Y

____ Edwin

Son

W

M

Oct 1881

18

S

PA

PA

PA

at school

10

Y

Y

Y

____ Walter

Son

W

M

Oct 1883

16

S

PA

PA

PA

at school

10

Y

Y

Y

____ Stanley

Son

W

M

Mar 1888

12

S

PA

PA

PA

at school

10

Y

Y

Y

____ Ethel

Dau

W

F

Jul 1890

9

S

PA

PA

PA

at school

10

____ Jack

Son

W

M

Apl 1897

3

S

PA

PA

PA

*Sheffield

7.  1910 Census Every-Name-Index/Images (online at Ancestry.com, Image #7 of 27):  827 Bank Street, Boro of Sewickley (1st Ward, South of Beaver St.), Allegheny Co., PA, Roll T624_1297 (Book 1), p. 230A, SN 4A, SD 23, ED 222, enumerated 18 Apr 1910, official enumeration date 15 Apr 1910 (extracted by Diana Gale Matthiesen):¤

1910:  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

17

18

19

20

21

22

23

24

25

26

27

28

*

827

69

71

Lyon Walter

Head

M

W

54

M1

31

PA

PA

PA

Eng

Lawyer

General Practice

Emp

Y

Y

O

F

H

____ Charlotte W

Wife

F

W

50

M1

31

6

6

PA

PA

IRL Eng

Eng

None

Y

Y

____ Walter Jr

Son

M

W

26

S

PA

PA

PA

Eng

Laborer

Auto Factory

W

N

6

Y

Y

____ Stanley

Son

M

W

22

S

PA

PA

PA

Eng

None

Y

Y

Y

____ Ethel

Dau

F

W

19

S

PA

PA

PA

Eng

None

Y

Y

____ Dacque W

Son

M

W

13

S

PA

PA

PA

Eng

None

Y

Y

Y

MGonnill Mary

Servant

F

W

28

S

IRL Eng

IRL Eng

IRL Eng

1903

Eng

Cook

Private family

W

N

0

Y

Y

Washington Henry

Servant

M

B

30

M1

20

VA

VA

VA

Eng

Coachman

Private family

W

N

0

Y

Y

*Bank Street

IMO, "Dacque" isn't a misspelling of "Jacque," it's the enumerator's misspelling of "Jack," the nickname for John.  Why in the world would an Irishman be named, "Jacque"?  We don't know who the informant was, here, and it could very well have been one of the servants.

8.  1920 Census Every-Name-Index/Images (online at Ancestry.com, Image #18 of 28):  237 Bank [Street], Borough of Sewickley (Ward 3), Allegheny Co., PA, Roll T625_1528 (Book 1), p. 48B, SN 7B, SD 24, ED 791, enumerated 23 Jan 1920, official enumeration date 1 Jan 1920 (extracted by Diana Gale Matthiesen):¤

1920:  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

16

17

18

19

21

23

24

25

26

27

28

*

237

193

226

Lyon Walter

Head

O

M

M

W

65

M

Y

Y

PA

PA

PA

Y

Attorney

Law office

OA

____ Charlotte

Wife

F

W

62

M

Y

Y

PA

PA

IRL

Eng

Y

None

____ Walter

Son

M

W

35

S

Y

Y

PA

PA

PA

Y

None

____ Stanley

Son

M

W

32

Wd

Y

Y

PA

PA

PA

Y

Attorney

Law office

OA

____ Jack Wyble

Son

M

W

23

S

Y

Y

Y

PA

PA

PA

Y

None

____ Charlotte M

GDau

F

W

4

S

N

N

PA

PA

PA

Y

None

____ Madeline R

GDau

F

W

3

S

N

N

PA

PA

PA

Y

None

O'Mally Sarah

Maid

F

W

60

S

Y

Y

PA

PA

IRL

Eng

Y

domestic

house work

W

Lafferty Silas

Gardner

M

W

50

M

Y

Y

PA

PA

PA

Y

gardener

garden

W

*Bank

9.  1930 Census Every-Name-Index/Images (online at Ancestry.com, Image #12 of 31):  827 Bank [Street], Sewickley Borough, Allegheny Co., PA, Roll 1990 (Book 1), p. 203B, SN 6B, ED 2-786, SD 12, enumerated 16 Apr 1930, official enumeration date 1 Apr 1930 (extracted by Diana Gale Matthiesen):¤

1930:  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

16

17

18

19

20

24

25

26

27

28

30

31

*

827

128

149

Lyon J Walter

Head

O

$40,000

R

N

M

W

76

M

25

N

Y

PA

PA

PA

Y

Lawyer

General Practice

W

Y

N

____ Charolette

Wife

F

W

73

M

22

N

Y

PA

PA

IFS

Y

None

____ J Walter Jr

Son

M

W

46

S

N

Y

PA

PA

PA

Y

Inspector

Steel Mill

W

Y

Y

WW

____ John W

Son

M

W

30

M

29

N

Y

PA

PA

PA

Y

Lawyer

General Practice

W

Y

N

____ Mildred G

D-in-law

F

W

30

M

29

N

Y

PA

MO

MO

Y

None

____ Charolette M

GDau

F

W

14

S

Y

Y

PA

PA

PA

Y

None

____ Madeline

GDau

F

W

13

S

Y

Y

PA

PA

PA

Y

None

*Bank

IFS = Irish Free State = Northern Ireland

10.  SSDI:  Social Security Death Index (online at RootsWeb.com):

Name	Birth	Death	Last Residence	SSN	Issued	Post-em
LYON, Stanley	20 Mar 1888	Nov 1964	(Pennsylvania)	203-12-8460	PA	Yes
LYON, Jack	23 Apr 1897	Dec 1978	15143 (Sewickley, Allegheny, PA)	167-05-0472	PA	Yes

11.  Wikipedia:  Walter Lyon (Pennsylvania).

12.  U.S. Attorneys for the Western District of Pennsylvania (online at the U.S. Department of Justice web site):

March 11, 1921 -- Walter Lyon

13.  Thomas Cushing, et al., eds.  1889.  History of Allegheny County, Pennsylvania. Chicago (republ. 1975 by Genealogical Publ. Co., Baltimore, for Clearfield Co. as A Genealogical and Biographical History of Allegheny County, Pennsylvania; online at GoogleBooks):

p. 563

WALTER LYON, attorney at law, Pittsburgh, was born in Shaler township, Allegheny county, Pa., April 27, 1853.  He was admitted to the bar in January, 1877, and has ever since been engaged in active practice.

14.  Lyon(s) Families Association of America: Database (on CD as of 22 Feb 2010; these are member submissions).

15.  Public Member Trees (online at Ancestry.com).

16.  WorldConnect / WorldTree (online at RootsWeb.com/Ancestry.com).