I’ve found a couple of intriguing entries in the indexes to the land records of Grant County. Both of these clipped images are from the grantee index. The first name is the person who purchased property. The second is the person who sold it:
The first is a sale from 25 Feb 1863 from Peter Weiss to Anton Weiss, my second great grandfather. The second is a sale from 14 Jun 1864 from Paul Weiss to Anton Weiss.
What do you think the chances are that these men are related to Anton? I’ve no idea actually, but it’s the only connection I’ve found between Anton and any other person named Weiss, save for the names of his parents in Germany. Are they cousins? Siblings? Completely unrelated? I don’t know. Time to do more research.