In a heartbreaking victim impact statement, Ms Liddle told the boys she hoped they were locked away for a long time before claiming her family were the ones serving a life sentence.
"My beautiful boy, rest in peace because there is none for us," Ms Liddle told the Brisbane Supreme Court.
The two boys who congratulated each other after Ms Liddle's son Angus Beaumont was fatally stabbed in a fight north of Brisbane face sentencing on Tuesday.
Year 10 student Angus died after a knife was thrust 14cm into his chest at Redcliffe in March 2020.
The two boys - who can't be named - were found guilty of murder by a jury in June.
They were both 14 at the time of the incident. One is now 16 and the other is 17.
"Your actions on that night were deliberate, callous and determined. You had every intention to hunt and kill," Ms Liddle said.
"Your family and supporters have been remorseless and consistently menacing towards our family.
"It is clear by these acts of violence ... the remorselessness you have shown ... your gutless, selfish actions ... that you have no intention of changing your behaviour."
Ms Liddle broke down as she described the night her family raced to the hospital after learning that her "beautiful, intelligent, healthy kid" had been stabbed.
"I didn't even get to say goodbye or tell my son how much he was loved," she said.
"You destroyed our family. Our life as we knew it ended that day."
Ms Liddle said since Angus' funeral, daily life had been a struggle.
She said his younger brother told them he doesn't want to go on a family holiday again because "it is too hard without Angus".
CCTV footage captured the incident when the two boys pursued a group of youths that included Angus.
Wearing knuckle dusters and handed a knife by another member of his group, Angus confronted the duo and he was stabbed in the chest after being set upon in a two-on-one fight.
The two boys are seen congratulating each other by slapping hands before running away as Angus lay dying nearby.
"It shows their mindset at the time that they were happy that this boy was stabbed," crown prosecutor Chris Cook said.
A murder weapon was never recovered.
However, the 14cm depth of the wound suggested it was "bigger than your average steak knife", the jury heard.
Both boys had long criminal histories with one offending from the age of 11.
One boy was on parole and the other was on bail at the time of the murder.
One of the boys on Tuesday also pleaded guilty to three more offences including dangerous operation of a vehicle after stealing a car in May 2022 while on bail for murder.
Ms Liddle said their Justice for Angus Beaumont foundation would continue to fight for Queensland juvenile justice law changes and curbing youth violence.