Joshua Joseph was with his 6-year-old sister when she passed out inside the family home in Rockland, Massachusetts.
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Their grandmother was babysitting them, but she can't speak English.
Joshua called his father, who urged him to hang up and call 911.
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That's just what he did, and he unlocked the front door to let first responders inside.
"I feel good, yeah. I was proud of myself. It's the first time I called 911, and I saved my sister's life," he said.
This week Joshua received the "Rockland Hero" award from the Rockland police and fire departments.
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Joshua's sister is doing fine after recovering from a high fever.