I finally found out who were Marie's parents.
I ordered the marriage record of Marie Soquet and Auguste Clairenbaut. They were married in Green Bay, Brown County, Wisconsin on 9 April 1874. Her parents are Jean Joseph and Seraphine Soquet .They are in the 1880 Census--Kewaunee, Wisconsin. Her siblings are in the 1900 Census and show immigration to be May 1871 from Belgium (August's parents were listed as Charles and Julia Clairenbaut, which I already knew)
The other Marie (if I remember correctly) married a John Eckles. I had been very curoius about the Soquet's you mentioned because there is all kind of information in the 1890/91 newpaper about them. He apparently killed his wife, Esperance. The trial is talked about in depth.