Celine Dion 'doesn't have control of her muscles', sister shares

It's been a year since singer Celine Dion first publicly shared that she had been diagnosed with stiff-person syndrome. Photo: TNS

It's been a year since singer Celine Dion first publicly shared that she had been diagnosed with stiff-person syndrome, a rare neurological disorder that prevents her from singing the way she's used to.

Last week, Dion's sister Claudette Dion said the Grammy winner "doesn't have control of her muscles."