I saw a hand painted wedding portrait of this couple in an antique store in St. Charles, Illinois. The information with the portrait sates Ivan was 16 when he married Kate.
The only Ivan Fuduric information I could find online states he was born 12 Nov 1888 and died March 1985. He was from Woodriver, Madison County, Illinois. However, there were many Fuduric's also in Marathon County. I don't know if this is the same man that appears in the portrait. If this is your ancestor, I will try to get the name of the antique store for you