I suspect that your Matthias SPAETH is somehow related to the following couple also married in Decatur, Macon county, IL. since Matthias had a son named Joseph Anton b. 1893.
Anton SPAETH Clara MELCHIORS m. 8 May 1884
The above Anton SPAETH was involved with Decatur Brewing Company which later became part of Pabst Brewing Company and he was a president or other high officer of the latter company.Other family members were also involved with the company.