Livremente adaptado do Comic book "A Sister" (A irmã) de Bastien Vivès, o filme acompanha Tom um adolescente timido de 15 nos que tem suas pacatas férias de verão com seus pais e sua irmã mais nova transformadas quando por destino outra familia chega trazendo junto Felix, seu filho de 17 anos. Com a vinda de Felix, Tom vive os dias mais intensos de sua vida e de forma sutil tem sua adolescência despertada por um turbilhão de sentimentos.
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/media/movies/covers/2019/02/45_BuMGH2e.jpg "Poster 1 de Filme Um Irmão (2018)")
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/media/movies/covers/2019/02/45_BuMGH2e.jpg "Um Irmão: Poster Oficial")
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