From the 1900 US census:
Name: Charles Bergetat
[Charles Berzetat]
Home in 1900: McKeesport Ward 11, Allegheny, Pennsylvania
Age: 44
Birth Date: Feb 1856
Birthplace: Sweden
Race: White
Ethnicity: American
Gender: Male
Immigration Year: 1885
Relationship to head-of-house: Head
Father's Birthplace: Sweden
Mother's Birthplace: Sweden
Spouse's name: Hanna
Marriage Year: 1880
Marital Status: Married
Years Married: 20
Residence : McKeesport City, Allegheny, Pennsylvania
Occupation: View on Image
Neighbors: View others on page
Household Members:
Name Age
Charles Bergetat 44
Hanna Bergetat 40 (March 1860, Sweden; 7 children, 5 living)
Charles Bergetat 18 (May 1882 Sweden)
Emma Bergetat 15 (Dec 1884, Sweden)
Erick Bergetat 10 (Oct 1889, Pennsylvania)
David Bergetat 8 (Jan 1892, Pennsylvania)
Peter Bergetat 4 (Aug 1895, Pennsylvania)
Carl Leonard, 1910 census:
Name: Charles L Bergstedt
Age in 1910: 27
Estimated Birth Year: abt 1883
Birthplace: Sweden
Relation to Head-of-house: Head
Father's Birth Place: Sweden
Mother's Birth Place: Sweden
Spouse's name: Emma C
Home in 1910: Pittsburgh Ward 16, Allegheny, Pennsylvania
Marital Status: Married 3 years
Race: White
Gender: Male
Year of Immigration: 1887
Neighbors: View others on page
Household Members:
Name Age
Charles L Bergstedt 27
Emma C Bergstedt 20 (born in Pennsylvania, one child)
Adolph L Bergstedt 3
World War I Draft Registration:
Name: Charles Leon Bergstedt
City: McKeesport
County: Allegheny
State: Pennsylvania
Birth Date: 6 May 1882
Race: White
Roll: 1894019
DraftBoard: 2
1920 census:
Name: Charles Berkstead
Home in 1920: McKeesport Ward 7, Allegheny, Pennsylvania
Age: 38 years
Estimated Birth Year: abt 1882
[abt 1883]
Birthplace: Sweden
Relation to Head-of-house: Head
Spouse's name: Emma
Father's Birth Place: Sweden
Mother's Birth Place: Sweden
Marital Status: Married
Race: White
Sex: Male
Home owned: Rent
Year of Immigration: 1886
Able to read: Yes
Able to Write: Yes
Image: 136
Neighbors: View others on page
Household Members:
Name Age
Charles Berkstead 38
Emma Berkstead 30
Adolph Berkstead 13
Peakl Berkstead 7
And 1930. Charles is not there, though Emma is listed as married.
Name: Emma Bergsted
Home in 1930: McKeesport, Allegheny, Pennsylvania
Age: 40
Estimated Birth Year: abt 1890
Relation to Head-of-house: Mother
Spouse's name:
Race: White
Occupation:
View Image
Neighbors: View others on page
Household Members:
Name Age
Adolf Bergsted 24 (head)
Emma Bergsted 40 (mother)
Pearl Bergsted 17 (sister)
Marie Bergsted 9 (sister)
Also, from findagrave.com here are some Bergstedts buried at Versailles Cemetery, in the town of McKeesport, Allegheny County, Pennsylvania.
Bergstedt, Blanch L b. unknown d. Jul. 13, 1917
Bergstedt, Charles E b. unknown d. Jan. 21, 1917
Bergstedt, Charles L b. unknown d. Jun. 2, 1953
Bergstedt, Ella Mae Strong b. unknown d. Apr. 5, 1959
Bergstedt, Johanna b. unknown d. Feb. 24, 1912
Bergstedt, Peter G b. unknown d. Nov. 4, 1958