The son of a millionaire property tycoon convicted for hacking his father, mother and brother to death with an axe has been injured in prison.

Henri van Breda, 23, was reportedly rushed to hospital on Thursday from South Africa's Pollsmoor Prison.

The former Perth schoolboy was last month found guilty of three counts of murder and is behind bars awaiting a sentencing hearing set for June 5.

The son of a millionaire property tycoon convicted for hacking his parents and brother to death with an axe has been injured in prison (pictured is Henri van Breda)

Henri van Breda, 23, was reportedly rushed to hospital on Thursday from South Africa's Pollsmoor Prison (Pictured are Martin Van Breda, right, wife Teresa, and eldest son Rudi, centre, and Marli, left)

Marli van Breda (pictured) survived a severed jugular but was unable to testify against her brother due to memory loss

His uncle Andre van Breda quashed rumours his nephew had attempted suicide, describing Thursday reports as 'total nonsense', News 24 reported.

Henri was taken to the hospital wing of the prison suffering a 'small scratch', Andre van Breda said.

The convicted triple murderer's attorney, Lorinda van Niekerk, said she could not confirm Henri had been taken to an external hospital.

Van Breda claimed his brother Rudi, 21 and parents Martin, 54, and Teresa, 55, were killed by a masked intruder with an axe who also wounded his sister Marli, then-15.

Van Breda claimed his brother Rudi, 21 and parents Martin, 54, and Teresa, 55, were killed by a masked intruder with an axe who also wounded his sister Marli, then-15

In May a judge found van Breda (pictured with girlfriend Janse van Rensburg) guilty of three counts of murder, one count of attempted murder and one count of misleading justice over the January 2015 attack

In May a judge found van Breda guilty of three counts of murder, one count of attempted murder and one count of misleading justice over the January 2015 attack.

Van Breda's parents and brother died of deep head and upper body axe wounds.

Marli survived a severed jugular but was unable to testify against her brother due to memory loss.

Judge Siraj Desai dismissed van Breda's claims that he watched helplessly from a bathroom as his family members were hacked to death.

He noted van Breda's 'peculiar lack of empathy' after calling emergency services almost three hours after the attack, after calling his girlfriend and sleeping.