I'm the King of the Castle (1989)

Thomas is the 12-year-old son of a millionaire who lives in a big mansion surrounded by woods in France. When his mother dies, his father hires a widowed maid to take care of everything while he is away. The woman brings her only son, Charles, to live with them and, hopefully, be company to Thomas.

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I'm the King of the Castle (1989) - IMDb

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