John HOLTHAUS from Germany

My Great Grandfather was John Holthaus. I know he was 11 years old when he came to america from Germany. He married Gertrude Ramler on Oct 25 1894 In Minnesota. I know these names of there children; Katherine, Adalaide, Herman, Alphonse, Margeret, Henry, Joseph. He died in Richmond Minnesota at the age of 95. The information I have is from newspaper clippings, most of them did not have dates on them. Any info would be great!