These children were not listed as Ellen's, and they were born before Tobias married Mary Frances, so I can only surmise that our subject had a wife between Ellen and Mary Frances. 

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

Tobias STRAUB Father: Geo.; Mother: Barbara Marriage: 23 Sep 1900, Wiconisco, Dauphin, Pennsylvania Spouse: Frances M. SHOOP Father: Joseph; Mother: Anchaline Source: "Extracted marriage record for locality listed in the record."

2.  1870 Census Images (online at Ancestry.com; Image #61 of 109):  Shamokin P.O., Shamokin Borough, Northumberland Co., PA, p. 122A, PN 61, 422/436, enumerated 19 Jul 1870, official enumeration date 1 Jun 1870 (extracted by Diana Gale Matthiesen):¤•

Stroube Tobias	21	M	W	Works in Mines			Penna
_______ Ellen	20	F	W	Keeping House			"
_______ Phoeba	2	F	W				"

3.  1880 Census Every-Name-Index/Images (online at Ancestry.com, Image #15 of 22 — indexed "Stroab"):  Williams Twp., Dauphin Co., PA, Roll T9_1125 (Book 1), p. 319C, PN 15, SD 3, ED 120, enumerated 11 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

133

149

Stroub Tobias

W

M

30

/

Laborer at Mines

6

PA

PA

PA

______ Ellen

W

F

30

Wife

/

Keeping House

PA

PA

PA

______ Febe A

W

F

12

Dau

/

/

PA

PA

PA

______ Henry S

W

M

8

Son

/

/

PA

PA

PA

______ George A

W

M

4

Son

/

4.  1890 Census:  the 1890 Census Population Schedules were destroyed.

5.  1900 Census Every-Name-Index/Images (online at Ancestry.com, Image #19 of 54):  South Street, Wiconisco Twp., Dauphin Co., PA, Roll T623_1404, p. 236A, SN 10, SD 9, ED 109, enumerated 7 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

13

14

15

19

20

21

22

23

24

25

27

179

183

Stroup Tobias

Head

W

M

Sep 1848

51

D

PA

PA

PA

Day Laborer

3

Y

Y

Y

R

H

Shoop Mary

Housekeeper

W

F

Aug 1861

38

M

PA

PA

PA

Housekeeper

0

N

N

Y

Stroup Wilbur F

Son

W

M

Jul 1889

10

S

PA

PA

PA

At School

1

Y

N

Y

______ Clara M

Dau

W

F

May 1892

8

S

PA

PA

PA

______ Tobias L

Son

W

M

Mar 1897

3

S

PA

PA

PA

6.  1910 Census Every-Name-Index/Images (online at Ancestry.com, Image #53 of 54):  Polish Rowe, Wiconisco Twp., Dauphin Co., PA, Roll T624_1338 (Book 2), p. 27A, SN 27A, SD 14, Ed 132, enumerated 2 May 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	17	18	19	20	21	22	23	24	25	26	28
513	516	Straub Tobias	Head	M	W	61	M2	19			PA	PA	PA	Eng	Laborer	Odd Jobs	W	N	0	Y	Y		R	H
		______ Mary F	Wife	F	W	46	M1	19	4	4	PA	PA	PA	Eng	None					Y	Y
		______ Tobias L	Son	M	W	14	S				PA	PA	PA	Eng	None					Y	Y	Y
		______ William	Son	M	W	9	S				PA	PA	PA		None							Y

7.  1920 Census Every-Name-Index/Images (online at Ancestry.com, Image #15 of 24):  Williams Twp., Dauphin Co., PA, Roll T625_1560 (Book 1), p. 244A, SN 8A, SD 12, ED 151, enumerated 15 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).

2

3

4

5

6

7

9

10

11

12

17

18

19

21

23

25

26

27

28

X

150

150

Straup Tobias

Head

R

M

W

71

M

Y

Y

PA

PA

PA

Y

Laborer

Coal Mines

W

______ Mary

Wife

F

W

58

M

Y

N

PA

PA

PA

Y

None

______ Lore?

Son

M

W

23

S

Y

Y

PA

PA

PA

Y

Laborer

Coal Mines

W

______ William E

Son

M

W

21

S

Y

Y

PA

PA

PA

Y

Laborer

Coal Mines

W

8.  1930 Census Every-Name-Index/Images (online at Ancestry.com, Image #7 of 30):  Lykens Trail, Williams Twp., Dauphin Co., PA, Roll 2028 (Book 2), p. 229A, SN 4A, ED 22-116, SD 19, enumerated 4 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	29	30
*	76	77	Straub Tobis J	Head	R	8	N	M	W	65	M	27	N	Y	PA	PA	PA	Y	Labor	state road	W	N	1-2	N
			______ Mary F	Wife				F	W	63	M	25	N	N	PA	PA	PA	Y	None
*Lykens Trail

9.  Anon.  1911.  Genealogical & Biographical Annals of Northumberland County.  J.L. Floyd & Co., Chicago.  On p. 984:

Tobias Straub, son of George and father of Harry J., was born in Schuylkill county, and for many years followed mining in Schuylkill and Northumberland counties.  He is now living at Wiconisco, Dauphin county, where he is employed at day's labor.  He married Ellen Schughart, who died in 1904.  Their children, besides Harry J., were: Agnes, who married James Tschopp, a carpenter by trade; George A., who was killed in the mines when but fifteen years of age; and Sallie, who died in infancy...

For full excerpt, see page for Tobias's son, Harry J. STRAUB.