Assuming they're Roman Catholic, to get married in the Church at least one of the couple needs to be Catholic and records of their baptism, confirmation, etc. would be shared between the individual's church and wherever they're getting married. You also run into this if you move around a lot, not just for marriage. If you want to be confirmed, you need to be baptised. Your baptismal records may be in another state or country and would need to be shared with your confirmation church.

In fact, the baptismal parish is the official keeper of your sacramental records, so when you’re married, the marriage is communicated to that parish and added to your sacramental record (likewise for confirmation if it doesn’t happen at your baptismal church, and, less commonly ordination will also be communicated there). When parishes are closed or consolidated, the bishop will indicate what parish becomes the new keeper of sacramental records for the closed parish.¹

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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.

Solution: Latin block chain