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

Frank P ROBARDS Spouse: Lizzie LOOMIS Marriage: 22 May 1881, Tuscola, Michigan Husband Age at Marriage: 22 Wife Age at Marriage: 20 Source: Marriage Records, 1851-1917, Tuscola County (Michigan). County Clerk

Frank P. ROBARDS Spouse: Lizzie LOOMIS Marriage: 06 Jul 1882, Saginaw, Michigan Source: Marriage Records, 1867-1914. Saginaw County (Michigan). County Clerk

These were not marriages, but the issuance of marriage licenses.  All I can surmise is that, for some reason, they did not marry after the issuance of the first license, but after the issuance of the second license, which is supported by the birth of the first child in 1883, rather than 1882.

2.  1880 United States Census and National Index (LDS Family History Resource File: CD-ROM Library):

Census Place: 3rd Ward, Flint, Genesee, Michigan
Source: FHL Film 1254579; NARA Film T9-0579; Pg 203C
	Relation	Sex	Marr	Race	Age	Birthplace	Occupation	Fa	Mo
[the landlord, his family, then 14 other boarders]
Frank P. ROBERTS	Other	M	S	W	22	IA	Clerk In Store	MI	MA
[12 more boarders]

3.  1890 Census:  the 1890 census population schedules were destroyed.

4.  1900 Census Index/Microfilm (online at Genealogy.com):  Hillsdale Twp., Hillsdale Co., MI, Roll T623_713, p. 146B, SN 2B, SD 3, ED 90, enumerated 5 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

26

27

28

49

51

Robards Frank P

Head

W

M

Jul 1858

41

M

18

IA

MI

Unk

Farmer

0

Y

Y

Y

O

F

F

51

_______ Elizabeth

Wife

W

F

Oct 1860

39

M

18

3

3

MI

NY

Eng

Y

Y

Y

_______ Rolla E

Daughter

W

F

May 1883

17

S

MI

IA

MI

At School

9

Y

Y

Y

_______ Frank P

Son

W

M

Oct 1886

13

S

IA

IA

MI

At School

9

Y

Y

Y

_______ Jay N

Son

W

M

Dec 1892

7

S

MI

IA

MI

At School

9

Y

Y

Y

Living two doors down from the elder Frank's father, James Nelson ROBARDS. 

5.  1910 Census Index/Images (online at Ancestry.com, Image #15 of 28):  50 Howell Street, Hillsdale City (Ward 3), Hillsdale Co., MI, Roll 649, p. 150A, SN 8A, SD 3, ED 107, enumerated 23 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

10

11

12

13

14

17

18

19

20

21

22

23

24

25

26

28

*

50

199

225

Robards Frank

Head

M

W

50

M1

27

IA

MI

Michigan

Eng

own income

Y

Y

R

H

_______ Elizabeth

Wife

F

W

48

M1

27

3

2

MI

NY

Eng English

Eng

None

Y

Y

_______ Jay

Son

M

W

17

S

MI

IA

Michigan

Eng

None

Y

Y

Y

Rubley Virginia

roomer

F

W

34

Wd

1

1

OH

PA

New York

Eng

Saleslady

dry goods

W

N

0

Y

Y

______ Jethro?

roomer

M

W

15

S

MI

MI

Ohio

Eng

None

Y

Y

Y

*Howell Street

6a.  1920 Census Every-Name-Index/Images (online at Ancestry.com, Image #22 of 34):  Hotel, Howell Street, Hillsdale (Ward 3D), Hillsdale Twp., Hillsdale Co., MI, Roll T625_768, p. 127A, SN 12A, SD 147, ED 125, enumerated 12 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	9	10	11	12	17	18	19	21	23	24	25	26	27	28
*	Hotel	265	273	Robards Frank	???er	M	W	60	Div	Y	Y	IA	MI	Scotland	Scotch	Y	real estate	agent	OA
*Howell Street

Frank is out of order, that is, he follows household 301/313.  If you page back to household 265/273 (Image #19 of 34, p. 125B), you find the other lodgers and staff in the hotel, which appears to be the same hotel he was living in in 1930.

6b.  1920 Census Every-Name-Index/Images (online at Ancestry.com, Image #26 of 29):  57 Broad St., Hillsdale City (Ward 4), Hillsdale Twp., Hillsdale Co., MI, Roll T625_768, p. 146B, SN 13B, SD 147, ED 126, enumerated 16/17 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	17	18	19	21	23	24	25	26	27	28
*	57	363	389	Robards Elizabeth	Head	O	F	F	W	58	D	Y	Y	MI	NY	England	English	Y	Secretary	Red Cross	W
*Broad St

7a.  1930 Census Index/Images (online at Ancestry.com, Image #8 of 37):  Smith Hotel, 6 North Howell St., Hillsdale City (Ward 3), Hillsdale Co., MI, Roll 993, p. 118B, SN 4B, ED 30-13, SD 17, 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	2	3	4	5	6	11	12	13	14	15	16	17	18	19	20	24	25	26	27	28	30
*	6	108	112	Robards Frank P	Lodger	M	W	71	D	25	N	Y	IA	MI	Can Eng	Y	Farmer	Own Farm	O	Y	N
*North Howell St

7b.  1930 Census Index/Images (online at Ancestry.com, Image #15 of 29):  57 Broad St., City of Hillsdale (Ward 4), Hillsdale Co., MI, Roll 993, p. 141A, SN 8A, ED 30-14, SD 17, enumerated 8 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	2	3	4	5	6	7	8	10	11	12	13	14	15	16	17	18	19	20	24	25	26	27	28
*	57	227	227	Robards Elizabeth	Head	O	4000	N	F	W	69	D	20	N	Y	MI	NY	Eng	Y	Secretary	Red Cross	W	Y
*Broad St

8.  Messages in the Robards Family Genealogy Forum (online at GenForum.com).