Prince Harry dropped a bomb on Monday when he revealed that he has written a memoir that he describes as “wholly truthful,” adding that it will be released next year. Now, sources are saying that Harry’s brother Prince William and father Prince Charles are “shaken up” and “nervous” about the memoir.

“The royal family is shaken up about the book,” a source told US Weekly, adding that William and Charles are “particularly concerned about what Harry will reveal” after his recent attacks on the royal family, which were “bad enough” already.

“They haven’t received a copy yet and don’t know what to expect,” the insider added. “It’s making them nervous.”

Harry shocked the world when he announced his memoir on Monday.

“I’m writing this not as the prince I was born but as the man I have become,” Harry said.

“I’ve worn many hats over the years, both literally and figuratively, and my hope is that in telling my story — the highs and lows, the mistakes, the lessons learned — I can help show that no matter where we come from, we have more in common than we think,” he continued. “I’m deeply grateful for the opportunity to share what I’ve learned over the course of my life so far and excited for people to read a firsthand account of my life that’s accurate and wholly truthful.”

The royal family has reason to panic about the book, given how much Harry has spoken out against them in recent months. In his explosive tell-all interview with Oprah Winfrey back in March, Harry was critical of the royal family as he talked about his decision to step down as a senior royal.

“[There was] a lack of support and lack of understanding,” Harry said at the time. “My biggest concern was history repeating itself, and I’ve said that before on numerous occasions, very publicly. … It was like, ‘I need to do this for my family.’ This is not a surprise to anybody. It’s really sad that it’s gotten to this point, but I’ve got to do something for my own mental health, my wife’s, and for Archie’s, as well, because I could see where this was headed.”

Harry has also been critical of his father’s parenting-style, saying that he is determined to “break the cycle” of generational trauma with his own kids.

“Just because you suffered, it doesn’t mean that your kids have to suffer. In fact, quite the opposite,” Harry said in his mental health documentary The Me You Can’t See. “If you suffered, do everything you can to make sure that whatever experiences, negative experiences that you had, you can make it right for your kids.”