Mariah Carey may be gearing up to celebrate her wedding anniversary and the first birthday of her twins Monroe and Moroccan on April 30, but the diva just got some bad news splashed across the tabloids. Her estranged sister Alison Carey Scott is suffering from liver cancer, on top of other problems.

Alison, who is HIV positive and is a former drug addict, revealed the news of her tragic condition to the National Enquirer (quotes via The Boombox) during an interview outside of her Riverhead, N.Y, hotel. Alison, 50, said she is sick, "not with AIDS…liver cancer." Carey's sister clearly has a difficult medical journey ahead of her.

Carey has had a rough year so far, in terms of health issues relating to people in her life. While she worked hard to shed the baby weight after birthing two healthy twins, her husband Nick Cannon suffered from a bout with kidney failure in January, forcing him to cut back on his work schedule and amend his eating habits. It was scary time for Carey and her family.

Now the news that her sister is battling cancer on top of HIV only adds to the stress in her life, regardless of the status of their relationship.