1.  Marriage Record:

2.  1910 Census Every-Name-Index/Images (online at Ancestry.com):  William LYON (æ 14, b. NY) is living in Youngsville, Warren Co., PA, with his parents (q.v.).  There is a Minnie COOPER (æ 8, b. PA) living in Sheffield Twp., Warren Co., PA (p. 230A), with her parents, Stephen COOPER (æ 52, b. NY) and his wife, Agnes (æ 28, b. PA), plus siblings.  Stephen and Agnes have been married ten years, so Agnes is Minnie's mother.  There is no other Minnie or Matilda COOPER in the county. 

3.  1920 Census Every-Name-Index/Images (online at Ancestry.com, Image #22 of 34):  North Main Street, Youngsville, Brokenstraw Twp., Warren Co., PA, Roll T625_1657, p. 38B, SN 11B, SD 17, ED 183, enumerated 12 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

3

4

5

6

7

9

10

11

12

16

17

18

19

21

23

25

26

27

28

*

261

297

Lyon William

Head

R

M

W

24

M

Y

Y

NY

PA

PA

Y

Carpenter

House

OA

____ Minnie

Wife

F

W

17

M

N

Y

Y

PA

PA

PA

Y

None

____ Harland E

Son

M

W

3/12

S

PA

NY

PA

None

*North Main Street

4.  1930 Census Every-Name-Index/Images (online at Ancestry.com, Image #11 of 40):  Sixth Street, Youngsville Borough, Warren Co., PA, Roll, p. 162A, SN 6A, ED 62-40, SD 2, enumerated 7 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

3

4

5

6

7

8

10

11

12

13

14

15

16

17

18

19

20

24

25

26

27

28

30

31

*

135

140

Lyons William A

Head

O

500

N

M

W

35

M

22

N

Y

NY

PA

PA

Y

Carpenter

Lumber Mill

W

Y

Y

WW

_____ Minnie M

Wife

F

W

27

M

16

N

Y

PA

PA

PA

Y

None

_____ Harla?? E

Son

M

W

10

S

Y

Y

PA

NY

PA

Y

None

_____ Geneva E

Dau

F

W

9

S

Y

PA

NY

PA

None

_____ Lloyd L

Son

M

W

8

S

Y

PA

NY

PA

None

_____ Charles E

Son

M

W

6

S

Y

PA

NY

PA

None

_____ Josephine V

Dau

F

W

5

S

N

PA

NY

PA

None

_____ William A

Son

M

W

4

S

N

PA

NY

PA

None

_____ Gerald J

Son

M

W

3

S

N

PA

NY

PA

None

_____ Merle L

Son

M

W

2

S

N

PA

NY

PA

None

_____ Cecil J

Son

M

W

11/12

S

N

PA

NY

PA

None

*Sixth Street

Listed four households from William's widowed mother, Mary E. LYON.

5.  World War I Selective Service System Draft Registration Cards, 1917-18.  Microfilm Series M1509 (4277 rolls), National Archives and Records Administration, Washington, DC (card images and index online at Ancestry.com):

Microfilm Roll | Form | No:		1926880 | 1295 | 69
1	Name in full | Age in yrs:	William Alexander Lyon | 21
2	Home Address:	Fourth Youngsville Pa
3	Date of Birth:	October 25th 1895
4	Are you (1) a natural born citizen…	Natural born
5	Where were you born:	Mayville NY USA
6	If not a citizen, of what country…	Citz of US
7	What is your present trade, occupation…	Mechanic
8	By whom employed:	Forest Fur Mfg Co
	Where employed:	Youngsville Pa
9	Have you [dependents]?:	Wife
10	Married or Single | Race:	Married | Caucasian
11	What military service have you had?	Artificer N.Y. Pa., 1 yr, NYMS
12	Do you claim exemption from draft?	Yes - In service at present
Signature:		William Alexander Lyon
1	Height | Build:	Medium | Slender
2	Color of Eyes | Color of Hair | Bald:	Blue | Brown | No
3	Physically Disabled:	No
Date of Registration:		Jun 5 1917
Draft Board:		Youngsville Pct., Warren Co., Penna

6.  Pedigree (online at the Sorenson Molecular Genealogy Foundation).

7.  WorldConnect / Ancestry World Trees (online at RootsWeb.com/Ancestry.com).