The Toy (movie, 1976)

When Francois, a journalist, tours a big store for an article, he is chosen by the son of the newspaper's owner, Rambal-Cochet, as his new toy. Needing money and unwilling to quit his job, Francois agrees to this ridiculous assignment. Gradually befriending the spoiled boy, he induces him to play at making a newspaper, unveiling publicly the tyrannical way of life of the father. The powerful emotional climax we experience with the child astonishes both men.