19. Lion (2016)
Based on a true story, Lion follows Saroo after he loses his brother at a train station at only five years old and ends up in Calcutta, where he does not understand the language. Eventually, he's adopted by an Australian family. Fast-forward 20 years and he decides to leave Australia and set out on a quest to find his birth mother and reconnect with his family. Though it ends happily enough, Lion is extremely emotional from start to finish.
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