Just started looking into family geneology. Yes this is the John Addis that married Cathrine Mc Grath. I have info that John Addis's fathers name was John Addis and his mothers maiden name wasMary Kelly, both from Ireland. Have you found any info on the Addis family or Mc Grath family? How are you related? They referenced you search with the Siebert name also. My sister-inlaw is a Siebert.