I copied this from the soundex of the 1900 census for Somers, Kenosha Co, Wisconsin.Julia's name isn't mentioned; she would have been married by 1900 probably.This might be her brother, John's family (with his (and Julia's?) parents living in the household):
Denig, John, age 38, b. Sept (yr. not given) Germany Margaret, age 40, b. Sept (yr. not given) Germany Lizzie M., daughter, age 17, b. Oct 1883 Wisconsin John P., son, age 7, b. Nov 1892 Wisconsin Lawrence S., son, age 5, b. 1895 Wisconsin Tony J., son, age 2, b. Aug 1897 Wisconsin Denig, Catherine, mother, age 69, b. May 1831 Germany Denig, Jacob, father, age 79, b. June 1820 Germany
The soundex card indicates this family can be found on vol 31, e.d. 11, page 7, line 14, in case you're able to view the actual report at the library.Maybe the Pitsch household was near John's residence.The actual report will also give the year of immigration so you'll know how far back to look in U.S. records for Jacob's family.
Also, listed in weddings in the Kenosha Evening News of October 10, 1931:Denig, Agnes and Vidas, Edward.
The Social Security Death Index lists a Lawrence S. Denig d. Sept. 1971 in Kenosha, Kenosha Co, WS and an Anthony J. Denig d. Feb. 1968 in Racine, Racine Co, WS.