William Leonard is said in his obituary to have this brother:
6.  Talmidge McCALL, b. 1890/1, PA
but Talmidge is not found with our subjects the 1900 census.

1.  Marriage Record:

2.  1850 Census Every-Name-Index/Images (online at Ancestry.com):  Caroline McCOOL (2/12, PA) is living in Cranberry Twp., Venango Co., PA (p. 25B), with William McCOOL (28, PA) and his presumed wife, Susanna (22, PA); however, the full household is difficult to unravel, especially in light of other censuses.  It's a can of worms I'm going to forego unraveling.

3.  1860 Census Every-Name-Index/Images (online at Ancestry.com):  Caroline McCOOL (10, PA) is living in Cranberry Twp., Venango Co., PA (p. 179) with William P. McCOOL (41, PA), and Matilda (40, NY).  Matilda is said to be the widow of John TOY (HOY?), but the problem is, William is said to have married her in 1841.

4.  1870 Census Every-Name-Index/Images (online at Ancestry.com):  Caroline McCOOL (20, PA) is living in Cranberry Twp., Venango Co., PA (p. 247A), with William McCOOL (50, PA) and Matilda (50, PA).

5.  1880 Census Every-Name-Index/Images (online at Ancestry.com):  can't find, and I really looked.

6.  1890 Census:  the 1890 Census Population Schedules were destroyed.

7a.  1900 Census Every-Name-Index/Images (online at Ancestry.com, Image #14 of 39):  Cranberry Twp., Venango Co., PA, Roll T623_1490, p. B, SN 7, SD 15, ED 140, enumerated 12 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

27

146

150

McCall William

Head

W

M

Apr 1857

46

M

21

PA

PA

PA

Pumper Oil Co

0

Y

Y

Y

O

H

______ Carlin

Wife

W

F

Jun 1851

49

M

21

7

6

PA

PA

PA

Keeping House

Y

Y

Y

______ Frank

Son

W

M

Aug 1880

19

S

PA

PA

PA

Day Labor

?

Y

Y

Y

______ Roubert

Son

W

M

May 1883

17

S

PA

PA

PA

Day Labor

?

Y

Y

Y

______ John L

Son

W

M

Aug 1885

14

S

PA

PA

PA

Day Labor

5

7

Y

Y

Y

______ Guy

Son

W

M

Apr 1891

9

S

PA

PA

PA

Y

Y

Y

This enumerator's handwriting was atrocious.  I have no idea how (in)accurate my extraction might be.  If Caroline was truly born in 1851, she's not the girl in the 1850 census.

8b.  1900 Census Every-Name-Index/Images (online at Ancestry.com, Image #14 of 39):  Cranberry Twp., Venango Co., PA, Roll T623_1490, p. B, SN 7, SD 15, ED 140, enumerated 12 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

21

22

23

24

25

26

27

28

145

149

McCool William

Head

W

M

Sep 1819

80

M

69?

PA

PA

PA

Farmer

Y

Y

Y

O

F

F

88

______ Becki?

Wife

W

F

Sep 1819

80

M

69?

12

8

??

PA

NJ

Y

Y

Y

McCall William

GSon

W

M

Sep 188?

1?

S

PA

PA

PA

Day Laber

7

Y

Y

Y

Carle Surmen

GSon

W

M

Feb 18??

?2

S

PA

PA

PA

Day Laber

Y

Y

Y

This enumerator's handwriting was atrocious.  I have no idea how (in)accurate my extraction might be.

9.  1930 Census Every-Name-Index/Images (online at Ancestry.com):  There's a Talmadge McCALL (æ 39) in Cranberry Twp., Venango Co., PA.

10.  Messages posted to the McCall Family Genealogy Forum (online at GenForum.com), including this obit:

Oct 31 1939 William L McCall ... died at the Oil City Hospital ... The son of Albert and Caroline McCool McCall, he was born on Sept 20 1888 at Hill City... Surviving are ... the following brothers: Frank and Robert of Montpeller, Ind; Guy of Erie; Talmidge of Pleasentville; and C.H. McCall of Ohio.

11.  Messages posted to the McCool Family Genealogy Forum (online at GenForum.).