I have two Peter Myszewski's in Milwaukee.

One fits your dates more closely, but I don't think this is the same one. Born 1889, died 1959. Divorced from Mary Kuehn in the 1920's.

The other was born circa 1864 and married Weronika Rysztykon in 1890. He may have spelled his name "Miszewski". I have not found any of their children yet, but perhaps he is Peter, Sr.

I did not find any Peter's in the other Miszewski branch I have.