If you believe him, Mimi has some demons she's gotta deal with!

Mariah Carey's brother Morgan, who hasn't spoken to the star in two years, is speaking out about his famous sister and her alleged substance abuse, and he fears that his sibling could wind up tragically gone too soon like Whitney Houston.

"Mariah was drinking through her pregnancy - even while she was nursing. I can't say that I have ever been around her when she was sober, and that's very scary," he told The National Enquirer.

Not only that, but Morgan alleges that, in addition to alcoholism, the "Heartbreaker" songstress is taking a cocktail of prescription pills like Zyprexa, Ativan and Depakote. His fears are that the mother-of-two could "die like Whitney Houston" if she doesn't get the help she needs. "She does not have a support system and she is not mentally capable," he added.

"If my sister turns up dead ... I'm not going to look the other way! Anyone who's filling her glass is jeopardising her life!" he warned.

We're not sure that selling out your own family member is the best way to remedy this!