Born in Saint-François of Madawaska, Théodule was the son of Docithé Nadeau and Édith Sirois. He studied at the College of Sainte-Anne-de-la-Pocatière and at the Grand Seminary in Quebec. He was ordained in Quebec, in 1903, by Bishop Bégin and, in 1909, he succeeded his uncle Father Joseph Pelletier as parish priest of Saint-Louis of Kent. In 1931, he was named chaplain at Hôtel-Dieu in Tracadie and after that, at the Foyer Saint-Camille-de-Lellis in Bathurst, and at Hôtel-Dieu in Edmundston. Five of his sisters, among others, the Sisters Brissette and Saint-Joseph were Sisters at Hôtel-Dieu in Saint-Basile. Photo taken in 1903.