A look at the actual 1930 census entry for Julius indicates that the boarder Arnold Klaus is not actually living in the Cawiezel household. Cawiezell is living at 716 1/2 West 1st Street in Davenport, Iowa. The address for the 12-year old boarder appears to be 927 West 3rd Street along with a notation.
|1930 U. S. Census, city of Davenport, Scott County, Iowa, ED 11 Sheet 2A, obtained digitally on Ancestry.com|
|1930 U. S. Census, city of Davenport, Scott County, Iowa, ED 11 Sheet 9A, obtained digitally on Ancestry.com|
Always look at the original. In cases like this the database just does not contain all the information because annotations such as these do not "fit the form."
In this case, it was assumed by the transcriber that the boarder listed after a "head of household" was actually living in that household. In reality, the head of household was on an entirely different page.