1.  Marriage Record:

2.  1880 Census Every-Name-Index/Images (online at Ancestry.com):  the only individual indexed in the census who comes close to being our subject is an unmarried William KLAISER (æ 25, b. Baden) in Buffalo, Erie Co., NY (p. 243).

3.  1890 Census:  the 1890 Census Population Schedules were destroyed.

4.  1900 Census Every-Name-Index/Images (online at Ancestry.com):  can't find William.  Anna is living with her first husband in Sacramento.

5.  1910 Census Index/Images (online at Ancestry.com, Image #27-28 of 36):  2120 T? Street, Sacramento City (Ward 9), Sacramento Twp., Sacramento Co., CA, Roll T624_93 (Part 1), pp. 236A-236B, SN 15A-15B, SD 2, ED 128, enumerated 25 Apr 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	12	13	14	17	18	20	21	22	23	24	26	27	28
*	2120	284	310	Klaeser William	Head	M	W	55	M1	5	Ger Germany	Ger Germany	Ger Germany	Eng	own income				Y	Y	O	F	H
				_______ Annie	Wife	F	W	57	M2	5	Ger Germany	Ger Germany	Ger Germany	Eng	none				Y	Y
[next page]
				Steinmeyer Henry	Adopted Son	M	W	34	M1	15	California	Ger German	Ger German	Eng	machinist	W	N	0	Y	Y
*T? Street

Henry STEINMEYER is Annie's adopted son from her prior marriage, but why is Henry enumerated with them?  Henry's also enumerated with his wife, Annie (SCHMIDT) STEINMEYER, who's in Ward 6 of Sacramento.  Were they estranged?

6.  1920 Census Every-Name-Index/Images (online at Ancestry.com, Image #10 of 22):  2120 T St., Sacramento City, Sacramento Co., CA, Roll T625_127 (part 1), p. 95B, SN 5B, SD 3, ED 131, enumerated 5 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

2

3

4

5

6

7

8

9

10

11

12

13

14

15

17

18

19

20

21

22

23

24

25

26

27

28

T? St

2120

311

323

Klaeser William

Head

O

F

M

W

64

M

1872?

Na

18?1?

Y

Y

Coblenz Ger

Ger

Ger

Ger

Ger

Ger

Y

Retired

_______ Anna C

Wife

F

W

67

M

1871?

Na

1873?

Y

Y

Hanover Ger

Ger

Ger

Ger

Ger

Ger

Y

None

Steinmeyer Annie M

D-in-law

F

W

43

Wd

Y

Y

California

Ger

Ger

Ger

Ger

Y

None

__________ Elmer

GSon

M

W

20

S

Y

Y

California

CA

CA

Y

Shipping Clerk

??? ???

W

Steinmeyer Fred

GSon

M

W

18

S

Y

Y

California

CA

CA

Y

Salesman

Dry Goods

W

Annie (SCHMIDT) STEINMEYER is the widow of Henry STEINMEYER, Anna's adopted son from her prior marriage.  There are two Coblenz's in Germany, one in Sachsen and one in Rheinland-Pfalz.

7.  1930 Census Index/Images (online at Ancestry.com, Image #12 of 34):  Pacific Old People's Home of Southern California, M. E. Conference, North Kingsly Drive, Los Angeles City (Block 794), Assembly District #35, Los Angeles Co., CA, Roll 133, p. B, SN 6B, ED 19-28, SD 16, enumerated 5 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	5	6	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25
*	122	Klaeser William	Inmate	R	N	M	W	74	Wd	40	N	Y	Germany	Germany	Germany	German	1876	Na	Y	Inst.
*North Kingsly Drive

William married Anna at the age of 50, so if the census is correct (though I suspect it's not), William had a prior wife.

8.  "Obituary: Annie Klaeser - 1921"  posted to the Sacramento County, California, Location Board (online at Ancestry.com/RootsWeb.com): 

Annie G. Klaeser died at her home, 1611 28th Street, Friday at the age of 68 years.  She was a native of Germany.  Surviving her is her husband, William Klaeser, her sisters, Mrs. Katie Glie, Mrs. Mary M. Siller and her sons, Harry L. Julius J., Eckman and John Behr and her grandchildren Elmer A. and Fred W. Steinmeyer... interment in the City Cemetery...