ABC News cited family sources as saying a private memorial service for family and close friends only will take place Thursday. The network interviewed Reynolds' son and Fisher's brother,
THR said services would be in Beverly Hills, where both women lived next door to each other.
People reported the burial will be Friday at Forest Lawn Memorial Park, as Todd said to ABC last week.
A public commemoration is expected later, but details for that have not been released yet.
Representatives of the family did not return a message from USA TODAY.
Todd, 58, said on ABC's 20/20 on Friday that the family, including Fisher's 24-year-old daughter
Now they'll be buried side by side at famed Forest Lawn, amidst all the other boldfaced Hollywood names laid to rest there.
Fisher, 60, died at a hospital four days after suffering a heart-related medical emergency on a flight from London to Los Angeles. The official cause of death has not been established and it's not clear when that might be available.
One day later, Reynolds, 84, died at a hospital after an apparent stroke at her son's home while discussing funeral plans for her daughter. She had suffered several smaller strokes in recent years, but Todd said he believes his mother could not bear to lose Carrie, having said in the past she did not want to outlive her daughter.
“She said she really wanted to be with Carrie,” Todd told ABC. “In those precise words, and within 15 minutes from that conversation she faded out and within 30 minutes, she technically was gone.”
Carrie's half sisters, Joely and Tricia Fisher (their mother is actress
“She kept saying that she wanted more time, and I knew that if Carrie wasn’t going to survive this, then Debbie would not," Joely said. "She would not last without her on the planet. She wouldn’t. And she didn’t.”