French film about father and son

This may sound odd, but I watched this film a while ago and found it fascinating. It was a father and son living together (son was about 17 or 18, I don't think mom was in the picture). The dad slowly finds out that his son is a pedophile. They spend the rest of the film with the dad coming to terms with it, then trying different methods to help his son. Near the end, the son finds a preteen boy and begins becoming friends with him. Dad finds out.

I think it may have been released in the late 2000's/early 2010's? That is what I am able to remember. Thank you for any help.