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Did find this on Rootsweb's World Connect Project Global Search:
Gurel, Caroline, Spouse Eduard Priess, he born 20 May 1860 in Polwiosek, Kowin or Korin (I need to recheck spelling of that) Poland, Caroline and Eduard married in 1885, no place shown. One child, Lena Pries, (no info on her), she married Emil Lange, he born 19 Jan 1891, Winnipeg, MB. The person who put in the info is at firstname.lastname@example.org and she is Iris Kornelsen and has a family website. Since she is related and in Canada maybe she can help you.
I did not find Gus Rosentreter anywhere.