Al-Shennag has been charged on four counts after the Toyota Kluger she was driving slammed into a year three classroom at Banksia Road Primary School in Sydney's southwest on Tuesday.
"This is the way a proper Muslim acts in a time of calamity and tribulation," says Mr Hraichie in the video, which has already had 57,000 views.
"The father says, all this stuff happening about the threats to this 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 funeral and all the people that are visiting. But, inshallah, once it's over, she is welcome to come and sit with the family, to have a meal and to talk about how they can move forward with this problem, what's happened.
"So please brothers and sisters, nobody abuse the school.
"The school had nothing to do with it. This is the will of the creator, he has ordained this, this was written."
Mr Hraichie said the boy's family had been hearing of mother-of-four Al-Shennag receiving abuse and that they didn't want that to happen. "They are telling everyone out there - forgive her, it's an honest mistake, it could have happened to any of us.
"We don't throw the world down on our brothers and sisters when an accident happens, we forgive."
The father, who runs a fruit shop in Punchbowl and has given permission for his son to be identified, said this was a test for the family. He thanked the school, police and community for their support and for attending the funeral.
He also sent his condolences to the other boy who died. "We can't forget that another angel has gone back to his creator because this boy was innocent and pure," said Mr Hraichie.
"You heard it from the father himself: When a calamity hits you, you say ... to Allah we belong, to Allah we return.
"This is what we forget these days is that when our brother feels pain, we must feel pain too."
He finished by encouraging everyone to have "love for each other", adding, "what a champion this man is", as he kissed his friend on the forehead.
"As we make our last drive to the burial site, inshallah, the father will be there to bury his own son and this is never ever wished upon anyone, that we bury our own kids," Mr Hraichie concluded as they arrived at the graveyard.
The emotional video has had thousands of reactions after it was posted on Facebook this afternoon.
"God has given him the will power to be strong," wrote one commenter.
"My heart breaks for everyone involved," added another.
"RIP little angel," said another.
Police believe the driver may have become distracted by something moments before the fatal crash in Greenacre. It's understood one line of inquiry is that a stray water bottle may have distracted her.
After her arrest, her lawyer Nick Hanna said his client was "deeply sorry for the loss and hurt suffered by the children, the school, the families and the community".
He added: "Her thoughts and prayers are with all those affected."
It is understood the mother-of-four's husband died earlier this year.
Seventeen children and one female teacher were treated at the scene by NSW Ambulance paramedics after the SUV slammed into the classroom of 24 students between the ages of seven and 11.
Al-Shennag has been charged with two counts of dangerous driving occasioning death, driving in a dangerous manner and negligent driving occasioning death.
Police on Thursday morning announced she had been hit with extra charges relating to children who survived the incident but sustained injuries and were taken to hospital.
Two eight-year-old girls were taken to the same hospital in a stable condition, and another girl, aged nine, was taken to hospital in a serious condition. Two of them were released on Wednesday afternoon.
Earlier, a family member of one of the students seriously injured in the crash told news.com.au she still hadn't been told her classmates had died. The relative said the eight-year-old girl had been in pain all night - but it was the emotional scars her loved ones feared the most.
"She still doesn't know her classmates passed away. She keeps asking about them," the relative said.
The family is delaying telling her the tragic news until she is stronger. "She just had stomach and chest pain all night and didn't sleep well due to what happened - she's very frightened."
Hundreds of mourners gathered at the Lakemba mosque earlier on Thursday, with more than a dozen pallbearers carrying the green casket and mourners spilling out into the street.
Banksia Road Primary School has reopened with specialist counsellors and additional teaching staff from nearby schools. A makeshift memorial has been growing outside the school gates.
Al-Shennag has been granted conditional bail and is scheduled to appear at Bankstown Local Court on November 29.