Any "time," Dennis, and anywhere...
Practically, I think you can assume a timeframe of the last 200 years and locations in both Canada and the US, if we suppose that mass movements between these two locations happened within this time period. Most of my relatives had emigrated by the mid-1800s. Also, some returned to PQ for marriage (because there were few Catholic parishes in northern VT at that time) and some preferred that they be returned to Canada after death to be buried in their "home" parishes, adding another layer of challenge for family historians.
But let's not complicate my original question. I'm hopeful it will simply draw responses from any Boudreau reader who has a LaBounty relative, or from any LaBounty reader who has a Boudreau relative. All of my relatives on both sides of my family going back to their entering Nova Scotia and Quebec in the 1500s are French and Catholic, so working in generalities is necesssary at this stage of my research--the population is simply too large to "manage" otherwise.