Frank Otteni is the son of Theodor Otteni and Theresia Frances Wörner.

He is 1 of 12 known children of Theodor and Theresia. His siblings are:
-Anton "Tony" Otteni (1868-1919)
-William "Bill" Otteni (1869-1916)
-Jacob "Jake" Otteni (1871-1943)
-Mary Otteni Zurn (1873-1944)
-John J. Otteni . (1875-1935)
-Rose Marie Otteni Metz (1878-1942)
-Frederick Theodore Otteni (1880-1952)
-Philomena "Minnie" Otteni Alberstadt (1881-1956)
-Joseph J. Otteni 1885-1960)
-Catherine Otteni Wurst (1887-1938)
-Edward Henry Otteni (1888-1920)
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1900 U.S. Federal Census, Frank Otteni resided in Millcreek Township, Erie County, Pennsylvania, Roll 1409, Page 80, Dwelling 171, Family 179
-Name: Frank Otteni
-Relation: Servant
-DoB: Sep 1877
-Age: 23
-MS: Single
-PoB: Pennsylvania
-Occupation: Farm Laborer
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In 1905, Frank married Alma E. Bolte, the daughter of William Bolte and Sophia Myers.

Erie County, Pennsylvania Marriage Docket, 1905, License 155, page 78
-Groom: Frank Otteni
-Age: 27
-Birth date: 23 Sep 1877
-Birth Place: McKean Twp, Pa.
-Residence: Erie, Erie County, Pa.
-Occupation: Car Inspector
-Previously married: No

-Bride: Alma Bolte
-Age: 17
-Birth date: 9 Dec 1887
-Birth Place: Millcreek Twp, Pa.
-Residence: Millcreek Twp, Erie County, Pa
-Previously married: No
-Father: Wm. Bolte
-Marriage Date: 10 May 1905
-Marriage Place: Erie, Pennsylvania
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Per the 1910 U.S. Census, Frank and Alma Otteni resided in McKean Township, Erie County, Pennsylvania. Listed are:
-Frank Otteni, age 32, born Pennsylvania
-Alma Otteni, age 23, born Pennsylvania
-Hazel Otteni, age 4, born Pennsylvania
-Robert Otteni, age 3, born Pennsylvania
-Frank Otteni, age 5/12, born Pennsylvania

In 1910, Frank and Alma Otteni are listed as married 5 years. Alma is listed with 3 children born and 3 children living.
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Per the 1930 U.S. Census, Frank and Alma Otteni resided in McKean Township, Erie County, Pennsylvania. Listed are:
-Frank Otteni, age 53, born Pennsylvania
-Alma Otteni, age 43, born Pennsylvania
-Frank Otteni, age 20, born Pennsylvania
-Roy Otteni, age 18, born Pennsylvania
-Norman Otteni, age 16, born Pennsylvania
-Thora Otteni, age 13, born Pennsylvania
-Ruth Otteni, age 9, born Pennsylvania
-Inaz Otteni, age 7, born Pennsylvania

In 1930, Frank is listed as first married at age 27. Alma is listed as first married at age 17.
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Frank and Alma are known to have 10 children.
• Hazel Marie Otteni Platz (1906–1998)
• Robert Conrad Otteni (1907–1966)
• Frank F. "Pete" Otteni (1909-1992)
• Roy M. Otteni (1911–1959)
• Norman Otteni (1913-1931)
• Thora E. Otteni Wurst (1916–2002)
• Ruth Otteni Wurst (1920-1997)
• Inez Mae Otteni Jackson (1922–1977)
• James H. Otteni (1927-1996)
• Susanne J. Otteni Roesch (1930–2017)
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OBITUARY Excerpt for Theodor Otteni
Erie Daily Times, Erie, Erie County, PA, 9 November 1911

Of his immediate family, he is survived by his wife, four daughters, Mrs. Michael Zuern, Mrs. Julius Metz, Mrs. Frank Alberstadt, Mrs. John Wurst; also eight sons, Anton, William, Jacob, John, Frank, Frederick, Joseph, Edward Otteni. One brother and one sister, residents of Germany, and 22 grandchildren, also survive his death.