This particular Y-DNA testing follows a direct paternal line, for example, your fathers, fathers, fathers, father etc.. A paternal grandmother does not carry a Y chromosome so you would need to test a direct male descendent of the brother of his Dugas grandmother.
That being said, most Dugas in Louisiana descend from Abraham Dugas, an Acadian. He had a few descendents move to Louisiana with the rest of the Acadian migration. There is also one Dugas Labreche; Joseph Elie Dugas who is part of my line that went to Louisiana. He married into the Verret family then their son into the Barrios family. This line descends from Jean Ducas dit Labreche. But for the most part, to the best of my knowledge, most Dugas' in Louisiana are descended from Abraham.
Hope this helps. The best DNA testing site, in my opinion, is www.nationalgeographic.com/genographic They take a while but give you good information once your test is complete.
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