Petra S. Fredrickson was born 13 January 1886 in Glenmore, Wisconsin, United States to Simon Fredrickson (1852-1935) and Anna Knutson (1851-1924) and died 16 October 1950 in Brown County, Wisconsin, United States of unspecified causes. She married Otto Frederick Demske (1883-1951) 8 September 1909 in Wisconsin, United States. Ancestors are from Norway.
|Offspring of Petra Fredrickson and Otto Frederick Demske (1883-1951)|
|Dorothy Demske (1910-1931)|| |
|Norman Demske(1913-1979)|| |
|Robert Carl Demske (1917-1974)||1917 Wisconsin, United States||1974 United States|| Esther Ellen Vetter (1917-1972)|
|Arthur Demske (1921-1998)|