A 43-year-old Australian woman has been sentenced to 20 years in jail for gassing to death two of her children and attempting to kill another, back in 2002.
The woman, who cannot be named, was last week found guilty of two counts of murder and one of attempted murder.
The Brisbane Supreme Court was told that she gassed her eight-year-old son and 10-year-old daughter at her Sandstone Point home, near Bribie Island, and tried to kill her then 16-year-old son.
At the time of the killings she had been angry that her ex-husband had won a Family Court order to have the children for the first half of the 2002-2003 school holidays, which included Christmas.
She sobbed as Justice Philip McMurdo described her actions as "horrible".
"The prime motivation was to avenge what you regarded as the wrong done to you by your ex-husband, the children's father," he said.
During a two-week-long trial the jury heard that in November 2002 the woman crushed sedatives in her children's milk before telling them they were "going for a drive".
As the car was parked in the garage of their rented home, she attached a hose from the exhaust pipe to the car's open window and ran the engine.
The act was a bid to take her own life as well as her son aged eight, a daughter aged 10 and her severely physically and intellectually disabled son, aged 16, the court heard.