I found Katherina and Peter on the 1900 census in Milwaukee County, she shows a birth date of Feb 1870, listed as Catherine Lesch, with her husband Peter Lesch, their eldest son Clarence,and Peter's 2 children from his first marriage. The strange thing is that she shows as being married 7 years (1893), and the mother of the 4 children, but the mother of Louise, Remi and Alvin was Mary Anna Krier according to births and christenings on the
www.familysearch.org website (Peter and Mary Krier married in 1893 and she died in 1897). I also found them on the 1920 and 1930 census, there was Margareth born in 1905, Anna born in 1906-1907 and Andrew born Sep 1910)