ST. PAUL, Minn. — High school senior Joshua Yang understands sacrifice. When he was midway through 10th grade, his mom survived a terrible car crash. But her body developed tremors, and she lost mobility. After countless appointments, doctors diagnosed her with Parkinson’s disease, saying it was likely triggered by brain injuries sustained in the wreck. At 15, Yang, an aspiring baseball player and member of his school’s debate team, took on a new role: his mother’s caregiver. Researchers estimate that Yang, now 18, counted among at least 5.4 million U.S. children who provide ca...

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