Samuel Davidson was drunk and affected by drugs while traveling at 133km / h in a 50km / h zone when in 2020 he hit a group of seven children who were walking and cycling along the road to Oatlands.
Brothers Abdallah Antony, Angelina and Sienna, along with their cousin Veronique Sakr, were killed.
Brothers Abdallah, Sienna, 8, Angelina, 12, and Antony, 13, died at the scene in the Oatlands alongside their cousin Veronique Sakr, 11. (AAP)
Davidson pleaded guilty to a series of charges including four counts of manslaughter.
Last year, he was sentenced to a minimum of 21 years in prison.
His maximum sentence was set at 28 years, with a period of parole of seven years.
Davidson appealed the sentence alleging that it was “manifestly excessive” and that the sentencing judge erroneously found that there was “no causal link” between his attention deficit hyperactivity disorder (ADHD) and the crime.
Judge Paul Le Gay Brereton did not claim that there was a link between Davidson’s ADHD and the crime, but considered it relevant to his “subjective case.”
The Oatlands crash accused Samuel William Davidson was originally sentenced to a maximum of 28 years in prison. (9 News)
Brereton also said that because of the publicity of the case and the “risk of being killed by other inmates in general custody,” Davidson had been placed in segregation for the first 11 months of his sentence.
He found Davidson prison to be more “onerous” because of his ADHD and the COVID-19 pandemic.
He also confirmed that the previous sentence was “unreasonable or clearly unfair.”
“His only act of negligent criminal driving had catastrophic consequences,” Brereton said at his trial.
“It was important to take into account all those consequences and the life lost in each case when arriving at an aggregate sentence; but I think it is also important to consider that it was the only criminal act that caused so much harm. .
“The applicant did not” embark on a deliberate series of discrete crimes. “
The four children were about to grab an ice cream when they were beaten. (9 News)
Brereton has sentenced Davidson to a minimum of 15 years in prison.
His maximum sentence was set at 20 years in prison with a five-year probation period.
“I am satisfied that the sentence I would impose recognizes the dignity of every child who was murdered for the plaintiff’s conduct,” the sentence says.