Daniel Dion, 59, died on Saturday near Montreal, a statement by the singer's spokeswoman said.
Ms Dion's family paid tribute to the father-of-two, calling him "a gentle and reserved man of many talents".
Her husband and former manager, Rene Angelil, died on Thursday aged 73. His death in Las Vegas came after two bouts with throat cancer.
|Celine and husband, Rene|