In a Michigan Marriage record, on October 5, 1891, Antonetta Dobrokowski Knach, age 30 (born in 1861 in Germany), married Andreas Bartkowiak, Jr., age 38 (born in 1853 in Germany), in Detroit, Michigan. Husband and wife were both previously married once. Andreas Bartkowiak, Jr. was employed as a blacksmith. The parents of the bride were Albert Dobrokowski and Agnes Worsnacki. The parents of the groom were Andreas Bartkowiak and Mary Franzkowiak. The ceremony was officiated by J. Rzadkowolski, pastor, and the witnesses were Stanislaus Madaj and Michael Fromekowiak (sp?).

According to the 1910 United States Census for Detroit (Ward 5), Wayne County, Michigan, Antonina Bartkowiak (age 49) was the wife of Andrew Bartkowiak (age 56). They were both born in Germany and immigrated in 1880.

Since Antonina Bartkowiak was 49 years old in 1910, that puts her date of birth as around 1861.

Antonia Bartkowiak appeared in the 1900 U.S. Census for Detroit, Michigan as a 40-year-old wife (born in December 1860 in Poland), residing with her husband, Andreas Bartkowiak, age 48 (born Nov. 1852), and their children Casimir, age 6 (born Feb. 1894), Agnes, age 5 (born Dec. 1895), and Victoria, age 3 (born Nov. 1897), Stanislaw Knack, 19-year-old son-in-law (probably stepson) (born in September 1881), and stepchildren, Mary Knack, age 17 (born Nov. 1883), and Cecilia Knack, age 15 (born Sept. 1885). The parents were born in Poland Germany and all the children were born in Michigan. Andreas Bartkowiak worked as a helper in a blacksmith.

According to the 1910 United States Census, Antonina Bartkowiak and Andrew Bartkowiak were residing in the household with their children, all born in Michigan: Casimir Bartkowiak (male, age 16 years), Agnes Bartkowiak (female, age 14), Victoria Bartkowiak (female, age 12), Francis Bartkowiak (male, age 9), and Joseph Bartkowiak (male, age 7). Also residing in the household were her children from her previous marriage, Stanislaw Knack (male, age 28) and Mary Knack (female, age 26).

According to the 1910 Census for Detroit, Michigan, the parents of Casimir Anthony Bartkowiak—Andrew Bartkowiak and Antonina Bartkowiak—were both born in Germany and immigrated in 1880. Andrew Bartkowiak was born in Germany (maybe Prussia) in 1854. Antonina Bartkowiak was born in Germany in 1861.

In a Michigan Marriage record, on April 25, 1923, Victoria Bartkowiak (age 25, born in 1898 in Michigan) married Andrew A. Skomski (age 25, born in 1898 in Poland) in Detroit, Michigan. Victoria Bartkowiak worked in sewing and Andrew A. Skomski was employed as an auto worker. The bride's parents were named Andrew Bartkowiak and Antonina Dobrogowski. The groom's parents were named John Skomski and Antonina Kaczonarckcyn (sp?). Joseph Lempke, a Catholic priest, officiated and the witnesses were Joseph Bartkowiak and Frances Skomski.

In Casimir Bartkowiak's Marriage Record (Detroit, Michigan), on May 23, 1916, Casimir gave his mother's name as "Antonette."

In the Delayed Registration Michigan Birth Certificate of her son, Casimir Bartkowiak, for March 1, 1894, dated February 8, 1943, Casimir Bartkowiak gives his mother's maiden name as Antonina Dobrogowski, with supporting evidence (supporting evidence being (sworn or notarized?) affidavits of a sister and a half-brother and a baptismal record from a church).

According to a Michigan Death Certificate, Antonette A. Bartkowiak, age 65, married, died on August 30, 1927 in Detroit, Michigan. She was born on December 25, 1861 in Posen, Poland. Her parents were named () Dobrogowski and Agnes Wozniak.

Antoinette (Antonina) Dobrogowski had a first husband, named Anton or John Knach or Knack, and a second husband, named Andrew Bartkowiak.

Antonetta Bartkowiak died at the age of 66 and was buried at Mount Olivet Cemetery in Detroit, Michigan on September 3, 1927.

She was Anna, Antoinette, Antonetta, Antonette, Antonia, and Antonina—and Dobrogowski, Dobrogowska, Knach, Knack, and Bartkowiak—depending on who was doing the reporting.

The Bartkowiak Family lot is described on the lot card on file at Mount Olivet Cemetery in Detroit, Michigan. Andrew Bartkowiak purchased the large family cemetery plot on October 30, 1916 for $375.00.

The Mount Olivet Cemetery lot card provides a great deal of information about three generations of the Knack-Bartkowiak Family.

To date, the remains of fifteen bodies are interred on the lot—Andrew Bartkowiak (buried on May 20, 1942), his wife, Antoinetta Knack Bartkowiak (September 3, 1927)—her children from a previous marriage, Stanley Knack (buried on July 11, 1953), Mary Knack Kwietniewski (July 16, 1951), Mary's husband, Stanley Kwietniewski (June 6, 1934), Cecilia Knack Kosecki (October 2, 1967), and Cecilia's daughter, Beatrice Kosecki (November 21, 1997)—and some of the children they had together, Agnes Bartkowiak Piontkowski (interred on October 4, 1980), Agnes's husband, John Piontkowski (April 11, 1967), Agnes and John's Infant Daughter Piontkowski (March 2, 1928), Victoria Bartkowiak Skomski (January 1, 1980), Victoria's husband, Andrew Skomski (February 21, 1977), and Victoria and Andrew's Infant Daughter, Rita Skomski (May 28, 1924), also other family members, Antoinette Piontkowski (March 15, 1920) and Dorothy Bartkowiak (June 19, 1924).

In a Michigan Death record, Tekla Dobrogowska, female, widowed, age 56, died on January 2, 1921 in Detroit, Michigan. She was born on September 23, 1864 in Poland. Her father's name was Knach. (Exactly whether or how she might be related to this biographee is unclear.)

There may be inconsistencies in the written, historical records.