(NEWSER) – A nurse in California thought she had won the world's biggest lottery jackpot, but soon discovered she had a son with the world's worst sense of humor. News that the 62-year-old mother of seven, who works at a health center in Pomona, had won the Powerball lottery spread across the country before it emerged that it was a prank by her son, who had called to tell her she had won,BuzzFeed reports.

"It's a joke. It's a prank ... by my brother," one of the nurse's daughters tells the New York Daily News. "It's embarrassing. This is too much for us." She says her mother didn't discover the prank until she came home from work, where she had celebrated with colleagues. She hasn't been identified.

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