Try familyseach.org - many of their children found there. It appears that she and August were born in Germany by some census info. Further searching the childrens details, may lead to more clues.
https://familysearch.org/
Examples:
Groom's Name: Charles Raasch
Groom's Birthplace: Milwaukee, Wisconsin
Bride's Name: Emma Draeger
Bride's Birthplace: West Grandville, Milwaukee Co., Wisconsin
Marriage Date: 02 Oct 1898
Marriage Place: West Granville, Milwaukee, Wisconsin
Groom's Father's Name: Charles Raasch
Groom's Mother's Name: Bertha Grunewald
Bride's Father's Name: August Draeger
Bride's Mother's Name: Julia Gust
Groom's Race: White
Indexing Project (Batch) Number: M01697-0
System Origin: Wisconsin-EASy
Source Film Number: 1014004
Reference Number: Page 14 Cert., 3827
Groom's Name: David Draeger
Groom's Birthplace: Germantown, Wash. Co., Wis.
Bride's Name: Emilie Wme. Ida Wilde
Bride's Birthplace: Freistadt, Ozaukee Co., Wis.
Marriage Date: 24 Jun 1893
Marriage Place: Freistadt, Ozaukee, Wisconsin
Groom's Father's Name: August Draeger
Groom's Mother's Name: Julia Gust
Bride's Father's Name: Franz Wilde
Bride's Mother's Name: Hanna Krueger
Groom's Race: White
Indexing Project (Batch) Number: M00347-3
System Origin: Wisconsin-EASy
Source Film Number: 1266884
Reference Number: 63