Popular Canadian singer, Celine Dion, can no longer control her muscles, according to her older sister, Claudette. A year after she cancelled her world tour, the 74-year-old sibling suggests that the singer’s return to the stage may take a while because of her ongoing battle with the progressive and incurable neurological disorder known as stiff person syndrome.

This disorder triggers the body to attack its nerve cells, thereby impacting mobility.

As reported by Daily Mail recently, Claudette said: ‘She works hard, but she has no control over her muscles. What breaks my heart is that she has always been disciplined. She has always worked hard. Our mother always told her, ‘You’re going to do well, you’re going to do well.’

“It is true that in our dreams as well as in hers, the goal is to return to the stage. In what capacity? Don’t know.’ Although research into the condition is ongoing, its rarity means progress has been slow.

“The vocal cords are muscles, and the heart is a muscle too. This is what’s coming for me. Because it’s a 1 in a million case, the scientists didn’t do that much research because it didn’t affect that many people.”

Claudette revealed that Celine’s charity, Fondation Maman Dion, has been bombarded with messages of support for the star.

She said: ‘Some people have lost hope because they are all diseases that are not well known. If you only knew how many calls the Foundation gets about Celine! People tell us they love her and are praying for her. She gets so many messages, presents, and blessed crucifixes.”

Claudette earlier revealed that despite working with “the best researchers in the field,” Celine has seen little improvement in her health.

While talking to Le Journal de Montreal, she said: “We can’t find any medicine that works, but having hope is important.”