Kathryn and Aaron Harney, of Downingtown, PA, play with 2-year-old Nathan, who has Tay-Sachs, a rare neurodegenerative disease.

Kathryn and Aaron Harney, of Downington, Pa., play with 2-year-old Nathan, who has Tay-Sachs, a rare neurodegenerative disease. SCOTT LEWIS FOR THE WALL STREET JOURNAL

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