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She was counted in the first Acadian census of 1671, in Port-Royal, with her parents and her seven siblings, at the age of 14. 
The couple had two sons: Pierre (b. c1676) and Abraham (b. c1678).
Marguerite Dugas died before 1686 since Pierre married Marie Guérin around that date and they were listed in the 1686 census with his two sons from his previous marriage, Pierre and Abraham.
Marguerite Dugas's mother was Marguerite Doucet. The Mothers of Acadia Maternal DNA project is conducting ongoing research to verify their origins. In 2010, Stephen White reported that Marguerite Doucet had a Haplogroup T2b. It is unclear how many of her descendants were tested to support this report.Ongoing test results are also reported. As of May 2014, 7 of her descendants have consistently reported a T2 haplogroup, indicating European origins.
Abraham DUGAST, gunsmith, 55, wife Marie Judith DOUCET 46; Children: Claude 19, Martin 15, Abraham 10, Marie 23, Anne 17, Margueritte 14, Magdeleine 7, Marie 5; cattle 19, sheep 3, 15 "arpents" of land.
Regarding Marguerite Dugas, the source and its explanation are laid out in my Dictionnaire genealogique des familles acadiennes (DGFA-1), under the family of Abraham Dugas and Marguerite Doucet, because the issue is more a matter of whom Marguerite Dugas married, rather than of who Pierre Arseneau's first wife was. The "source" is Placide Gaudet, who states that Marguerite married Pierre in his Genealogies acadiennes, p. 60. In compiling the DGFA-1, I noticed, just as Ms. Petit has, that there is absolutely no documentary information that actually mentions that Marguerite was Pierre's first wife. So, I wanted to know how Placide Gaudet got the idea that she was. Well, Placide did a lot of work with the dispensations, but he never got the habit of systematically explaining the conclusions he drew from them (although we do have at least some of his scribbled "charts" here and there in his papers, but it is often impossible to find the ones we might like to see). Rather than waste time searching for a scribble which might no longer exist, I asked Paul Delaney to look through the first four generations of the Arseneau descendants for dispensations that might support Placide's statement that Marguerite Dugas had married Pierre Arseneau. The results are summarized in the "Note de P. Delaney" on page 563 of my DGFA-1. The third degree dispensation in the record of the marriage of François Arseneau to Anne Cyr in 1746 shows us that Pierre Arseneau's first wife must have been either a Bourgeois or a Dugas, and then the fourth degree dispensation in the marriage record of Jean Boudrot to Françoise Arseneau just eight days later in 1746 shows that of the two choices only the Dugas one can be sustained. Those two dispensations establish that Pierre married a Dugas, and of Abraham Dugas's five daughters mentioned in the 1671 census only one, Marguerite, was not still "at home" in 1686. Thus we can deduce that it was she who married Pierre (Arseneau).
Pierre ARSENAULT 40, Marie GUERIN 24; children: Pierre 10, Abraham 8.
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Marguerite is 19 degrees from Ingrid Bergman, 29 degrees from Bernardo Bertolucci, 20 degrees from Diahann Carroll, 19 degrees from Claudette Colbert, 22 degrees from Ronnie Colman, 19 degrees from Kirk Douglas, 16 degrees from Rutger Hauer, 19 degrees from Cloris Leachman, 19 degrees from Marcello Mastroianni and 18 degrees from Mark Weinheimer on our single family tree. Login to find your connection.