Francis Stwora BD 1879 Austria

I am attempting to research my great grand father's genealogy. He was born in 1879 in Austria and immigrated to the United States. He married Rosalie Copija in Minneapolis and died in Ladysmith Wisconsin in 1959. There are no immigration records and no family records. My father and all other living grand children have no memory of him ever talking about any other relatives in the United States. They do recall him speaking of brothers possibly named Adam and Josef. We believe that they did not travel here with them but that they stayed in Austria/Poland.