AceShowbiz -

Mariah Carey's sister Alison Carey wants to spill all hidden secrets regarding her famous sibling as she recovers from decades of drug abuse. It reportedly includes the "All I Want for Christmas Is You" hitmaker's satanic rituals and sex abuse claims.

Alison, who is receiving treatment at a sober house in upstate New York, has been "clean and sober for a while now," a source close to the siblings reveals to Radar Online, "She's starting to remember a whole lot of stuff about her childhood, her upbringing and a lot of things that happened. It's some pretty heavy duty stuff."

According to the source, Alison has even claimed to have detailed memories of devil worshiping and racial problems between Mariah and her father Alfred Roy Carey.

Mariah's brother Morgan previously revealed that their mother had forced her daughters to participate in "horrible" and "evil" satanic rituals that sometimes turned sexual.

Another close friend of Alison's named David Baker claims on his blog, "For most of her life, Alison has had only vague memories of the abuse she endured as a child. As a means of self-protection, her mind suppressed recollections of the horrific events she was exposed to and made to take part in."

"But now, as her brain recovers from the injury she received in a still-unsolved attack in her own home, details of that abuse are coming to the surface," he adds, "We are now documenting her descriptions of events that have haunted her like a malevolent ghost for the past 50 years, an unseen but disturbing presence, and will be making them public in a format still be be decided."