EXCLUSIVE: Angelina Jolie and Brad Pitt's adopted son Pax, 19, called his father a 'world class a**hole' and 'despicable person' who makes his four youngest children 'tremble in fear' in explosive Instagram rant

Brad Pitt's son Pax called his father a 'world class a**hole' who makes his four youngest children 'tremble in fear' in an explosive Instagram rant posted for Father's Day 2020, DailyMail.com can reveal.

'You have made the lives of those closest to me a constant hell,' Pax wrote.

'You may tell yourself and the world whatever you want,' he added., 'but the truth will come to light someday.

Then he sarcastically added: 'So Happy Father's Day, you f*****g awful human being.'

Angelina Jolie adopted Pax from an orphanage in Ho Chi Minh City, Vietnam, in 2007. He was three years old and had been dumped as a newborn by his heroin-addicted biological mother.

Brad formally adopted him the following year.

When Pitt, 59, and Jolie, 48, split in 2016 just two years after they had married in a private ceremony in France, the children stayed with their mother amid reports of an altercation aboard a private jet between eldest son Maddox and his father.

Now it is clear that the relationship between Pax and Pitt is also troubled with the 19-year-old accusing his dad of making his life 'hell' in the extraordinary social media rant.

Pax posted the broadside at Pitt to the stories section of his private Instagram account when he was 16. He accompanied it with a photo of Brad receiving an Oscar for best supporting actor for Once Upon a Time...in Hollywood four months earlier.

A source has confirmed the private account does belong to Pax. 'It's the account he uses for friends – friends from school mostly. He never says much about his parents, keeps himself to himself, so that was unusual.'

Pax did not say if there was a specific event that had set him off or whether it was a culmination of years of tension

In his post, Pax called his adoptive father 'a world class a**hole' adding: 'You time and time and again prove yourself to be a terrible and despicable person 

'You have no consideration or empathy toward your four youngest children who tremble in fear when in your presence.

'You will never understand the damage you have done to my family because you're incapable of doing so.'

Although Pax was the third child – after brother Maddox and sister Zahara – that Jolie adopted, he is one year older than Zahara.

The four youngest children, who he claimed Pitt made tremble would be Zahara, now 18, and the couple's three biological children, Shiloh, 17, and 15-year-old twins Knox and Vivienne.

Jolie and Pitt met on the set of Mr. and Mrs. Smith in 2005 while he was still married to Jennifer Aniston. They insisted at the time that there was no infidelity but after a picture emerged of them on a beach in Kenya with Maddox, Aniston filed for divorce.

But their fairytale romance fell apart in 2016 and the couple once known as 'Brangelina' have been embroiled in acrimonious battles ever since.

Their divorce was finalized in 2019, and although Jolie initially had full custody of the children, an agreement was thrashed out in 2021 that allowed Pitt to have them 50 per cent of the time.

But shortly afterwards, John Ouderkirk, the judge in charge of the case, was revealed to have close business relationships with Pitt's lawyers.

As a result, he was disqualified from the case and custody was returned to Jolie with Pitt allowed 'custodial visits' only.

Pitt was also investigated by the FBI and the Los Angeles Department of Children and Family Services over child abuse allegations following the alleged altercation with Maddox on a private jet ficve days before Jolie filed for divorce.

Maddox is said to have stood up for Jolie during a fight between his parents.

A source later told People, Pitt had been drunk at the time, adding: 'There was an argument between him and Angelina.

'There was a parent-child argument which was not handled in the right way and escalated more than it should have.'

Jolie told authorities Pitt had behaved 'like a monster' on the jet. 

Pitt was subsequently cleared of all charges and has since quit both booze and smoking cannabis and was photographed attending Alcoholics Anonymous meetings in September 2016.

Although neither Pitt nor Jolie have ever spoken publicly about the incident, Jolie told Vogue in 2021 that she had dumped Pitt for the 'wellbeing' of her family.

She added: 'It was the right decision. I continue to focus on their healing. Some have taken advantage of my silence, and the children see lies about themselves in the media, but I remind them that they know their own truth and their own minds.

'In fact, they are six very brave, very strong young people.'

The couple are still involved in a contentious $350 million battle over Chateau Miraval, the vineyard they bought in France. Jolie sold her half to a subsidiary of Stoli Group after the plane incident because, her lawyers said, she was 'uncomfortable' being involved in the sale of alcohol.

In a filing this summer she called her ex a 'bully' who acted emotionally, irrationally and 'ultimately illegally' over the vineyard. He accused her of stagiing 'a hostile takeover of the business.

Pax remains close to his mother and has been seen with her in New York where she has been staying while creating her new Atelier Jolie line.

He has now graduated from high school – choosing to skip the graduation ceremony to avoid paparazzi.

Earlier this year, it was reported that he had become an artist – creating work under the pseudonym 'Embtto' – but the Page Six story turned out to be a hoax.

DailyMail.com reached out to Angelina and Pax's representative for comment but received no response. Brad's rep declined to comment.