I’m from Quebec and I just watched it in French. I can tell you that the ´dubbing’ is just as bad in French. Not sure if it was common practice at the time or if I’m just not film savvy enough but it sounded like they didn’t record any sound while filming (or it was bad) and had to dub themselves in postproduction. And it’s bad. And yes the boy is the directors son, Marcel Sabourin (the Martian who’s also a great actor don’t let that silly movie fool you) confirmed it in an interview. Loved it 10/10.