Celine Dion's sister shared that the singer has lost control of her muscles amid her battle with Stiff-Person Syndrome. In a recent interview Claudette Dion shared an update on the singer's health saying the 55-year-old "is working hard [to battle through her disorder], but she doesn’t have control of her muscles." She continued, "There's no doubt that in our dreams and in hers, the idea is to come back to the stage. In which state? I don’t know. The vocal cords are muscles, and the heart is also a muscle."