Frank Polak (Pollak), Katerina ; Milw WI

I'm trying to track my grandparents arrival from Bohemia (?) to Milwaukee in the early 1900's probably thru Ellis Island.Frank had a brother Mathias (aka "Joker")who with his wife Antonia, also lived in Milw.Frank and Katerina (Katherine) had 4 children; Mary, Joseph (my dad), Edward, and Teresa.My grandfather was born 29 DEC 1881. My grandmother's maiden name was HRUZ, and apparently was born in Mikulhof, Czech, 6 OCT 1889. Any help would be fabulous! Thanks.