Featureflash Photo Agency / Shutterstock.com Mariah Carey’s estranged brother is suing her for defamation and intentional infliction of emotional distress. In legal docs obtained by TMZ, Morgan Carey alleges that Mariah damaged his reputation in her 2020 book, “The Meaning of Mariah Carey.” For more visit TMZ.com. Mariah Carey’s Estranged Brother Sues Her for Defamation…