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The mother of Edmee and Catherine is unnamed. Mitochondrial DNA tests of her descendants shows that she was of European descent. Many trees list the mother as of native origins, but this has been disproven in the Mothers of Acadia mtDNA project.
The name "Collineau de Montaguerre", with a few variants as it got copied from one genealogy to another, was apparently, initially, a code name for a female brick wall in New France genealogies. This is supported by the fact that most Collineau de Montaguerre individuals are set as earliest ancestors, female, and paired off with Unknown spouses.
"It had long been known that a number of dispensations found in the marriages between the descendants of Edmée Lejeune and those of Catherine Lejeune proved that the two women were sisters, and it was thought that with the far more extensive documentation that had become available since Father Godbout’s death there might be found some additional previously unknown or unnoticed dispensations that would support his suppositions. It was also realized, however, that if marriages between Lejeune descendants were traced where dispensations ought to have been granted according to Father Godbout’s presumptions, but were not, then those presumptions would be cast into doubt and thereby rebutted
"It must be remembered that there are no records that actually state that any of the early Lejeunes in Acadia were siblings. The only thing that had been observed to connect them was their common name, which gave rise to a presumption that they were related. The presumption insofar as it respected Edmée and Catherine Lejeune was long ago replaced by a certainty because of dispensations found in certain marriage records in the Port-Royal registers."
It may be possible to confirm family relationships with Unknown by comparing test results with other carriers of her mitochondrial DNA.
Mitochondrial DNA test-takers in the direct maternal line: