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Alexa Ray Joel shared an update on her father Billy Joel's health as the legendary singer battles a brain disorder.

Billy, 76, announced that he had been diagnosed with normal pressure hydrocephalus (NPH) – w hich affects his vision, hearing and balance -- on social media in May.

The "Riverside Way" singer, who is the daughter of Billy and his ex-wife, supermodel Christie Brinkley, 71, told Fox News Digital that her father has been "incredibly resilient" in the face of his health struggles.

"Unfortunately, I didn't get this characteristic from him because I like to express how I'm feeling always," Alexa, 39, said. "He doesn't whine, especially in his older age."

She continued, "I don't know, maybe he did more when he w

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