French film


I remember watching a French film 4 or 5 years ago and the plotline fascinated me but I haven't been able to remember the title since. I believe it was about a father finding out that his teenage son is a pedophile and the two of them trying to find different ways of dealing with it. Eventually the dad catches his son with a preteen boy and his son goes off to jail. If this rings a bell for anyone, that would be helpful. Thank you.

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