Angela Flores, 38, was arrested after three children were found dead inside the home in West Hills, Los Angeles County, on Sunday. She had been expected to be arraigned Wednesday, but it was continued until Aug. 10. Flores remains in jail on $6 million bail.
According to authorities, the children's mother admitted to killing them with the help of her 16-year-old son. She has been charged with three counts of murder.
The teenager, who has not been publicly identified, was arrested on one count of murder and was being held without bail at Sylmar Juvenile Hall.
"We all grieve for these children. The loss of their young lives is a tragedy that has affected our entire community," District Attorney George Gascón said. "My prosecutors are working to hold accountable those responsible for their deaths."
The L.A. County coroner's office on Tuesday identified the victims as 8-year-old Nathan Yanez, 10-year-old Kevin Yanez and 12-year-old Natalie Flores.
On Sunday morning, officers responded to the home after receiving a call of an assault with a deadly weapon, according to the L.A. Police Department.
Neighbors said it was the teenager who went next door to call for help Sunday around 7:30 a.m.
Investigators have not said how the children were killed. The victims suffered signs of trauma, but the investigation is ongoing and authorities on Tuesday were awaiting autopsy results to determine exactly how they died.
Neighbors said they called police Saturday night after Flores sat on their front porch for several hours, acting erratically.
"She started to scream, asking for the Bible. 'Where is my Bible?' Then she said 'You know, you know, I killed my kids.' But they think she was crazy. The police, they think that she was crazy," neighbor Blanca Hernandez said.
She said Flores was taken to the hospital, adding that police didn't know where she came from and didn't do a welfare check until the next morning when the 16-year-old called for help.
Neighbors say the family had only moved into the home about three months ago but often heard arguments and screaming, including the night before the children were found.