1.  Marriage Record:

2.  1870 Census Images (online at Ancestry.com; Image #19 of 31 — enumerated and indexed "Steaupe"):  Auburn P.O., Butler Twp., Subdivision 49, Dekalb Co., IN, p. 253A, PN 19, enumerated 10 Aug 1870 (extracted by Diana Gale Matthiesen):¤•

1870:  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	15	19
192	192	Steaupe Simon	28	M	W	Farmer	4000	700	Ohio		/
		_______ Adelia	29	F	W	Keeping house			Indiana
		_______ Elmer E	7	M	W				"
		_______ Arkisan B	4	M	W				"
		_______ Carlton P	4	M	W				"
		Miller Isabell	10	F	W				"	/
		Steaupe Elizabeth	62	F	W	Boarding			Penn
		_______ Mariah	21	F	W	house work			Indiana

Elizabeth (MILLER) STRAUB is Simon's mother; Mariah is Simon's sister.  I have not identified Isabell.

3.  1880 Census Images (online at Ancestry.com; Image #12 of 21):  Butler Twp., De Kalb Co., IN, p. 192D, PN 12, SD 6, ED 89, enumerated 7 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).

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9

10

13

21

24

25

26

97

102

Stroup, Simon

W

M

46

/

Farmer

Indiana

Penn

Penn

______, Adelia

W

F

39

Wife

/

Keeping house

Indiana

Ohio

Ohio

______, Elmer E

W

M

17

Son

At home

/

Indiana

Ind

Ind

______, Carlton P

W

M

14

Son

At home

/

Indiana

Ind

Ind

______, Arkinson B

W

M

14

Son

At home

/

Indiana

Ind

Ind

______, Henry C

W

M

9

Son

Indiana

Ind

Ind

______, Gary O

W

M

3

Son

Indiana

Ind

Ind

Otto, Emma

W

F

20

Servant

/

Servant

Ohio

Ohio

Penn

Living next door to Simon's widowed mother, Elizabeth (MILLER) STRAUB/STROUP, and Simon's sister, Barbara (STRAUB) BASSETT.