Plot: Mrs. Gallienne, a rather temperamental upper middle-class lady, has three children, two of whom she considers as her sons and another she calls Guillaume. Logically indeed, the latter teenage creature does not picture himself as a boy, rather as a girl or at best as a homosexual. But how can a mother act in such an objectionable way? And why? Through a series of painful chain of experiences, Guillaume will discover little by little who he is actually and will manage to break free from her pernicious influence.
Alternative Plot: While a boy is growing up, everyone assumes he is a girl.
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