Sister

In the midst of war, a young boy named Yamil longs for peace and the return of his father, who he has only known through letters and photographs. One day, his mother brings home a silent girl named Oksana, and entrusts Yamil with the task of caring for her as if she were his own sister. As they spend time together, Oksana slowly opens up, and Yamil learns the joy of having a sibling. But as the war rages on, their bond faces challenges that test the limits of their friendship and the definition of family.

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Some movies that have similar genres and were produced around the same time as Sister include Hacksaw Ridge, The Zone of Interest, Jojo Rabbit, All Quiet on the Western Front, 1917, The Covenant.