Lisa, you're welcome. Regarding the 1930 Census for Louis, the information I listed is all the database has. From what I can see, it looks as if that's Louis with his wife and children. Notice the approximate years of birth. Compare with the Vernon Co., WI, 1880 Census, when Louis was 3, and the Tombstone Inscription, Louis (1876 - 1968).
I think that John J. (ca. 1793 - 1873) was father of Friedrich A. SCHLOTTMAN(N), b. ca. 1843, who had children as of 1880: Fred, Nic, Charles, Louis, & George.
Check with Jerry and Mickie Parr who post on the Vernon Co., WI, site to see whether they can identify Lina (probably a shortened version of Evangelina or Magdalena).
Can you add information about Charles SCHLOTTMAN?