Celine Dion's Brother: Hours to Live ... Dying Of Cancer

Celine Dion's older brother Daniel is on his deathbed and only has hours left to live after a fight with cancer ... TMZ has learned.

The news comes less than 24 hours after the death of Celine's husband, Rene Angelil, who also died of cancer.

Daniel, 59, has been fighting brain, tongue and throat cancer in Celine's native Montreal according to his sister, Claudette. He's surrounded by family, including their 89-year-old mother, but it's so bad the family doesn't think he'll make it through another week.

Rene also died of throat cancer.