The father of a boy killed on Tuesday in the horrific Sydney school car crash has appeared on social media alongside an undertaker saying the family forgives the driver.

Ahmad Hraichie, whose profile says he is an undertaker, posted a live Facebook video on Thursday afternoon from a hearse, which had the eight-year-old boy's coffin in the back.

Mr Hraichie translates for the boy's father sitting next to him in the front of the car.

"We have a special message here for the lady that was involved in the accident," he said, referring to 52-year-old driver Maha Al-Shennag.

"The father said that all this stuff happening about the threats to lady and the abuse is not from them.

"No retaliation is coming from the family of the boy. They have forgiven.

"If anything, they want to sit with this lady and talk with her and tell her 'we forgive you' but as you know right now it is a hard time with the funeral and with all the people visiting.

"Once it is over she is welcome to come and sit with the family and have a meal and talk about how they can move forward with this problem."

'This boy was loved by everyone'

A police escort surrounded the car which was taking the boy's body to be buried at Rookwood cemetery after a funeral attended by more than 300 people at Lakemba Mosque this afternoon.

"We are here at the funeral of our brother of … the eight-year-old boy that was killed on Wednesday [sic] by accident," Mr Hraichie said.

"This boy was loved by everyone. His dad is loved by everyone."

The funeral was attended by so many that mourners spilled out onto the street. ( AAP: David Moir )

The boy buried on Thursday was killed alongside his classmate, also eight years old, when a car driven by Ms Al-Shennag crashed into a classroom of a Greenacre school on Tuesday.

The mother-of-four has been charged with dangerous driving occasioning death and negligent driving, in regards to the two boys who were killed at Banksia Road Primary School.

Ms Al-Shennag was also charged with dangerous driving occasioning grievous bodily harm and cause actual bodily harm by misconduct, in relation to three girls who were injured in the incident.

Two girls were discharged from hospital on Wednesday and a third remains in hospital in a stable condition.

Father says not to blame the school

The driver of the car, Maha Al-Shennag, is a widowed mother of four. ( Supplied: Facebook )

Mr Hraichie said the father was "very happy … this is the way a proper Muslim acts in a time of calamity."

"So please brothers and sisters nobody abuse the school … they had nothing to with it."

Ms Al-Shennag communicated through her lawyer that she was "very distraught" about what had happened.

"Her thoughts and prayers are with all those affected," the lawyer said.

Mr Hraichie said the family did not condone or take part in any threats made to Ms Al-Shennag since she was identified.