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

John E. ROOD Spouse: Charlotte LINKER or SCHUNK Marriage: 25 Dec 1879, St Clair, Michigan Source: Marriage Records, 1838-1917. St. Clair County (Michigan). County Clerk.

If this marriage date is correct, then Mary, at least, is a child from an earlier marriage.  Given their ages, we would expect both of them to potentially have had an earlier spouse.

2.  1880 Census Images (online at Ancestry.com; Image #18 of 39):  Trout Street, St. Clair City 1st Ward, St. Clair Co., MI, p. 476C, PN 19, SD 3, ED 392, 174/185, enumerated 19 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

7

8

9

10

11

13

24d

25

26

174

185

Rood John

W

M

32

/

Laborer

Eng

Eng

Eng

____ Charlotte

W

F

32

Wife

/

Keeping house

Bavaria

Bavaria

Bavaria

____ Mary F

W

F

3

Daughter

/

Mich

Eng

Bav

____ William M

W

M

12/366

May

Son

/

Mich

Eng

Bav

Chamberlain Ed

W

M

39

/

Clerk in store

Mich

Mass

Vermt

Seager John

W

M

19

/

Clerk in store

Canada

Miller Mary

W

F

42

/

Cabin maid on boat

Mich

Kentuck

Mich

Dorton/Doston Catherine

W

F

29

/

D

Cabin maid on boat

Mich

Kentuck

Mich

Hopkins Samuel

W

M

76

/

Mass

Mass

Mass

_______ Mary

W

F

72

Wife

/

Keeps house

Conn

Conn

Conn

Wilbor Charlott

W

F

45

Boarder

/

Ohio

Mass

Conn

______ Charlott

W

F

16

Boarder

/

Attends School

Ohio

Mass

Ohio

______ Lucien

W

M

14

Boarder

/

Attends School

Ohio

Mass

Ohio

Johnston May

W

F

16

Boarder

/

Attends School

Mich

Scotland

Mich

Jochim Josephine

W

F

20

Servant

/

Mich

German

German

For some reason, written vertically in the visitation column of this record is the word, "Supplemental."  This record ends Ward 1.