***½ Sister Movies about wayward kids are a European specialty. This new film by Ursula Meier, about a 12-year-old grifter (Kacey Mottet Klein) at a Swiss ski resort and his useless sibling (Léa Seydoux), deepens the specialty. With a single revelation, the work of minimalist realism you assumed you were watching curves out into expertly done melodrama that you don’t realize has so moved you until it’s over. In French, with subtitles. (97 min., unrated) (Wesley Morris)
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