A clinical forensic specialist says there was a stark contrast between Henri van Breda's injuries and those of his family's.
Van Breda is on trial for the murder of his parents and older brother, and for severely injuring his younger sister in 2015.
The State has continued its questioning of Dr Marianne Tiemensma on Tuesday in the Western Cape High Court.
Tiemensma has told the court the shape and sizes of Van Breda’s injuries show they were self-inflicted.
Tiemensma adds the injuries don't correlate with Van Breda's claim that he’d sustained them during a struggle with an attacker at the foot of the bed in the room he'd shared with his older brother, Rudi.
The doctor says the extent of the rest of the family’s injuries, which were done with an axe, is in stark contrast to the superficial cuts on Van Breda’s body.
Van Breda claims he was cut as he held onto the assailant’s arms.
He alleges the attacker had an axe in one hand and a knife in the other