Daniel Dion was 59. He was the eighth of 14 Dion siblings.
The singer’s husband, Rene Angelil, died Thursday at the age of 73 at the couple’s home in Las Vegas.
Both men suffered from throat cancer.
Angelil’s funeral will be held Friday at the Notre-Dame Basilica in Montreal where the couple married.
The following day a memorial service will be held for her late brother, with a formal funeral a few days after that, the family spokesman said.
In 1994, when Celine Dion was 26 and Angelil was twice her age, the couple married in an extravagant wedding that was televised live in Canada, and splashed all over glossy magazines.