Mariah Carey is being sued by her older brother for defamation and emotional distress caused by her recent memoir, The Meaning Of Mariah Carey.
Morgan Carey says the book falsely suggests he was violent and is seeking unspecified damages.
He said since the book's release, he has suffered "extreme mental anguish" and "serious damage to his reputation".
The filing comes a month after Mariah's sister sued her for $1.25 million over the same memoir.
Alison Carey said passages claiming that she gave Valium to 12-year-old Mariah, tried to pimp her out and threw boiling tea on her were "outrageous" and meant to "humiliate and embarrass" her.