My great grandfather was Gustav Hanko and his wife was Adelia Klaus. They lived in Chicago Heights, IL, specifically the Holbrook area. Are they the people you are looking for? If so, they had 7 children...Art, Louise, Paul, Marion, Edward, Emma and Dorothy. I am the granddaughter of Edward.

Cook County, Illinois, Marriages Index, 1871-1920
Name: Adelia Klaus
Age: 20
Gender: Female
Birth Year: abt 1888
Marriage Type: Marriage
Marriage Date: 2 May 1908
Marriage Place: Chicago Heights, Cook, Illinois
Spouse Name: Gustaw Hanko
Spouse Age: 31
Spouse Gender: Male
FHL Film Number: 1030439
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1910 United States Federal Census
Name: Adeilia Hanko [Adeelia Hanks]
Age in 1910: 23
Birth Year: abt 1887
Birthplace: Russia
Home in 1910: Bloom, Cook, Illinois
Race: White
Gender: Female
Immigration Year: 1895
Relation to Head of House: Wife
Marital Status: Married
Spouse's Name: Gustof Hanko
Father's Birthplace: Russia **
Mother's Birthplace: Russia **

Gustof Hanko 34 both parents born Germany * states arrived US 1891
Adeilia Hanko 23 states arrived US 1895
Arthur Hanko 1 [1 6/12]
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1930 United States Federal Census
Name: Gust Hanks [Gust Hanko]
Gender: Male
Birth Year: abt 1877
Birthplace: Germany
Race: White
Home in 1930: Bloom, Cook, Illinois
Map of Home: View Map
Marital Status: Married
Immigration Year: 1892
Relation to Head of House: Head
Spouse's Name: Adelia Hanks
Father's Birthplace: Germany
Mother's Birthplace: Germany

Gust Hanks 53 States arrived US 1892
Adelia Hanks 42 State Adelia & both parents born Poland ** States arrived US 1906
Levise Hanks 18
Paul Hanks 12
Emma Hanks 8
Edward Hanks 6
Marion Hanks 5
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"United States Census, 1940"
Name: Adelia Hanko
Event Type: Census
Event Date: 1940
Event Place: Bloom Township, Cook, Illinois, United States
Gender: Female
Age: 51
Marital Status: Married
Race (Original): White
Race: White
Relationship to Head of Household (Original): Wife
Relationship to Head of Household: Wife
Birthplace: Russia
Birth Year (Estimated): 1889
Last Place of Residence: Same House
District: 16-67
Family Number: 168
Sheet Number and Letter: 9B
Line Number: 41
Affiliate Publication Number: T627
Affiliate Film Number: 774
Digital Folder Number: 005459515
Image Number: 00383

Head August Hanko M 62 Germany
Wife Adelia Hanko F 51 Russia **
Son Paul Hanko M 22 Illinois
Daught Emma Hanko F 18 Illinois
Son Edward Hanko M 16 Illinois
Daught Marion Hanko F 15 Illinois

There seems to be a lot of name variation with this family -Surname Hanko /Hanks - Adelia/ Adelaide/ Adeilia - Gustaw/ August/ Gust/ Gustof

1920 United States Federal Census about Adelaide Hanks
Name: Adelaide Hanks [Adelaide Hanko]
Age: 33
Birth Year: abt 1887
Birthplace: Russia
Home in 1920: Bloom, Cook, Illinois
Race: White
Gender: Female
Immigration Year: 1906
Relation to Head of House: Wife
Marital Status: Married
Spouse's Name: Gustav Hanks
Father's Birthplace: Russia
Mother's Birthplace: Russia
Able to Read: Yes
Able to Write: Yes

Gustav Hanks 43 born Germany
Adelaide Hanks 33 born Russia
Arthur Hanks 11
Louisa Hanks 7
Paul Hanks 2 [2 4/12]
Dorothy Hanks 0 [2/12]

Baltimore, Passenger Lists, 1820-1948 and 1954-1957
Name: Gustav Hanka
Arrival Date: 26 Aug 1891
Age: 15
Estimated birth year: abt 1876
Gender: Male
Port of Departure: Bremen, Germany
Ship Name: Weimar
Port of Arrival: New York, New York
Page: 3

Final destination Illinois

Also listed Louise 43 and Paul 10