I work for the church that used to be St. John Catholic Church in Monches. On our cemetery list, I found a William Coughlin who was born in 1858-1919, and his wife Margaret. In the town of Erin, there was another church, St. Patrick in Thompson, which is now closed but I believe the records are at St. Kilian in Hartford. I have copies of a study that was done of the tombstone inscriptions, but it is at work. I will try to look for it next week. The only problem with that is the tombstone would have to have been readable. However, the archives at the Archdiocese of Milwaukee has copies of all the parish records in southeastern Wisconsin. You could start there: www.archmil.org
or the Hartford History Room, in the Hartford Library.