First french Canadian prime minister?
Sir Wilfrid Laurier was the first French Canadian Prime Minister.
Though the first native-born Canadian Prime Minister from French Canada was John Abbott, he was a Freemason and tried to get the United States to Annex Canada, so we won't count him. Wilfrid Laurie, who served as Prime Minister of Canada from 1896-1911, was the first francophone Prime Minister and took conciliatory steps between French and English Canada. I think he's your best bet. Sir Wilfrid Laurier