I find the following in the census recors for 1910 and 1920. In the 1910 census original images Carl Nilsson's middle initial looks more like a J than an F.
1910 United States Federal Census
about Carl F
Nilsson Name: Carl F
Nilsson[Carl J
Nilsson]
Age in 1910: 43
Estimated Birth Year: abt 1867
Birthplace: Sweden
Relation to Head-of-house: Head
Father's Birth Place: Sweden
Mother's Birth Place: Sweden
Spouse's name: Anna M
Home in 1910: Chicago
Ward 25, Cook,
Illinois Marital Status: Married
Race: White
Gender:
Male Year of Immigration: 1899
Neighbors: View others on page
Household Members: Name Age
Carl F
Nilsson 43
Anna M
Nilsson 39
Carl S
Nilsson 12
John E
Nilsson 11
Gurlie M
Nilsson 8
Ermi S
Nilsson 3
1920 United States Federal Census
about Carl J
Nilsson Name: Carl J
Nilsson Home in 1920: Chicago
Ward 33, Cook (Chicago),
Illinois Age: 52 years
Estimated Birth Year: abt 1868
Birthplace: Sweden
Relation to Head-of-house: Head
Spouse's name: Anna M
Father's Birth Place: Sweden
Mother's Birth Place: Sweden
Marital Status: Married
Race: White
Sex:
Male Home owned: Rent
Able to read: Yes
Able to Write: Yes
Image: 1032
Neighbors: View others on page
Household Members: Name Age
Carl J
Nilsson 52
Anna M
Nilsson 48
Carl G
Nilsson 22
Eric J
Nilsson 20
Gurli M
Nilsson 18
Irma M
Nilsson 13
I don't find any Nilsson's in Freeport in either of these census records.
In 1930 there is an Anna M
Nilsson living as a boarder in Chicago.
The
Illinois Death Index has death records for:
Anna M
Nilsson 04.20.1934
Carl
Nilsson 08.28.1940
Both died in
Cook County.
I don't know if this will help you at all as they are not in Freeport.