Celine Dion recently surprised fans when she revealed she had been suffering from "severe and persistent muscle spasms" that meant she wouldn't be able to go ahead with her new Las Vegas residency, and now her sister, Claudette Dion, has given an update on her health.SEE: Celine Dion shares health update as she announces heartbreaking newsSpeaking to French magazine, Voici, Claudette said: "What's happening to her is sad. But it's not serious, otherwise she would have told me.