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1. This is one of two significant cases that impact some of the two-church parishes that are part of the last decade of reorganization in the Archdiocese of Chicago. Sacramental records will be kept at only one of the churches. The other situation reflects Holy Thursday and Easter Vigil Masses. A parish is only allowed to have one Mass on Holy Thursday and on Easter Vigil, so the two-church parishes will only celebrate at one of the churches even if they had sufficient clergy to have those Masses at both locations.
The Catholic Church keeps pretty good records, for the most part. In New England, Quebec, and maritime Canada, many people can trace their ancestry back to at least the 1500s based on these records.