Bessie was born before our subjects married; she appears to be Margaret's youngest sister. 

1.  Ohio County Marriages, 1774-1993 (online at Ancestry.com):

Charles Sahs

Maggie Miller

20 Aug 1874

Knox Co.

2.  1860 U.S. Census Every-Name-Index/Images (online at Ancestry.com):  Charles is presumably still in Germany.  Mary MILLER (æ 8, OH) is living in Mt. Vernon, Knox Co., OH, with her parents (q.v.).

3.  1870 U.S. Census Every-Name-Index/Images (online at Ancestry.com):  Charles not found, so possibly still in Germany.  Maggie MILLER (æ 18, b. OH) is living in Mt. Vernon, Knox Co., OH, with parents (q.v.).

4.  1880 U.S. Census Every-Name-Index/Images (online at Ancestry.com, Image #4 of 14):  Rogers Street, Mount Vernon (Ward 2), Knox Co., OH, Roll 1038, p. 259D, PN 3, SD 5, ED 160, enumerated __ 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

15

20

24

25

26

*

30

30

Sachs Charles

W

M

31

/

Laborer

Prussia

Prussia

Prussia

_____ Margaret

W

F

26

Wife

/

Tick

/

Iowa

Ohio

Ohio

_____ Josephine

W

F

6

Dau

/

Ohio

Prussia

Iowa

_____ Anna G

W

F

5

Dau

/

Ohio

Prussia

Iowa

_____ Mary C

W

F

2

Dau

/

Ohio

Prussia

Iowa

*Rogers

Margaret should be 28 years old.

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

6.  1900 U.S. Census Every-Name-Index/Images (online at Ancestry.com, Image #38 of 42):  Mt. Vernon (Ward 2), Clinton Twp., Knox Co., OH, p. 82B, SN 19B, SD 13, ED 14, enumerated 20 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

16

17

18

19

20

21

22

23

24

25

27

*

447

448

Sacks Charles

Head

W

M

Feb 1844

56

M

29

Germany

Germany

Germany

1870

30

Na

Day Laborer

0

Y

Y

Y

R

H

_____ Margaret M

Wife

W

F

Mar 1854

46

M

29

16

9

Ohio

Ohio

Ohio

Y

Y

Y

_____ Bessie M

Dau

W

F

Feb 1873

27

S

Ohio

Germany

Ohio

Y

Y

Y

_____ Josephine

Dau

W

F

Mar 1874

26

S

Ohio

Germany

Ohio

Y

Y

Y

_____ Annie N

Dau

W

F

Apr 1875

25

S

Ohio

Germany

Ohio

Y

Y

Y

_____ Mary

Dau

W

F

Dec 1878

21

S

Ohio

Germany

Ohio

Y

Y

Y

_____ Ethel M

Dau

W

F

Aug 1881

18

S

Ohio

Germany

Ohio

Y

Y

Y

_____ Walter N

Son

W

M

Jun 1880

19

S

Ohio

Germany

Ohio

Day Laborer

0

Y

Y

Y

_____ Alice L

Dau

W

F

Jul 1884

15

S

Ohio

Germany

Ohio

Y

Y

Y

_____ Charles F

Son

W

M

Feb 1888

12

S

Ohio

Germany

Ohio

At School

9

Y

Y

Y

_____ George E

Son

W

M

Feb 1890

10

S

Ohio

Germany

Ohio

At School

9

Y

Y

Y

*West Water Street

•  Margaret should be age 48 — she was age 8 in the 1860 census and age 18 in the 1870 census.
•  Charles was age 31 in 1880; he should be 51 here.
•  Charles & Margaret were married in August of 1874, so they have been married 25 years, not 29.
•  Bessie was born before Charles & Margaret married, and she wasn't with them in the 1880 census.  Margaret does have a younger sister named, Bessie, this age, who was orphaned by the death of their mother in 1893.

7.  1910 U.S. Census Every-Name-Index/Images (online at Ancestry.com):  Widower Charley SACHES (æ 68, b. Germany) is living in Columbus (Ward 5), Franklin Co., OH (p. 67A), with his married daughter, Alice, and her family.

8.  1920 U.S. Census Every-Name-Index/Images (online at Ancestry.com):  Widower Charles J. SACHES (æ 76, b. Germany) is living at 63 South St. in Detroit City (Ward 18), Wayne Co., MI (p. 74B), with his married son, Charles F. SACHES, et al.

9.  Michigan Death Records, 1897-1929 (online at Ancestry.com):

Name	Margaret Sachs [Margaret Miller]
Gender | Age | Race	Female | 63 | White
Death Date	3 Nov 1909
Death Place	Detroit, Wayne, MI
Father	Geo Miller
Mother	Nancy Miller

10.  Find-a-Grave: Entries (online at FindaGrave.com):

Name	Alice L Sacks Bodle	Margaret Ann "Maggie" Miller Sacks	Charles J Sacks
Birth	9 Jun 1884 Knox Co., OH	1846	15 Feb 1841 Baden-Württemberg, Germany
Death	6 Jan 1913 Detroit, Wayne Co., MI	1909	14 Dec 1922 Knox Co., OH
Burial	Mound View Cemetery, Mount Vernon, Knox County, Ohio
Inscription	[For inscription, please see Margaret's parents' page.]
Memorial #	92242857	92242960	92242974

Tombstones, especially ones that appears to have been placed years later, are notoriously inaccurate; please see this page.  Margaret's parents were married in 1848, and her age in the 1850 census (8) and 1860 census (18) place her birth in 1851/2.  Charles's ages in the censuses show him as 31 in 1880 (b. 1848/9);  56 in 1900 (b. Feb 1844); æ 68 in 1910 (b. 1841/2); 76 in 1920 (b. 1843/4). Baden-Württemberg did not become a German state until 1952; in 1841, he would have been born in either Baden or Württemberg.  The only birthplace other than "Germany" I've found for him, so far, is Prussia (in northern Germany), which is geographically distinct from both Baden and Württemberg (in southern Germany).  Additionally, back then people tended to equate Prussia with Germany, so we can't be certain Prussia was correct either.