Kimberley - Sentencing procedures against the young Griekwastad murderer will continue in the Northern Cape High Court on Wednesday.

The 17-year-old boy has been convicted of three murders and rape.

On March 27, the court found him guilty of the murders of Griekwastad farmer Deon Steenkamp, 44, his wife Christel, 43, and their daughter Marthella, 14. They were shot dead on their farm Naauwhoek on April 6, 2012.

He was also found guilty of raping the girl and lying to police.

On Tuesday, a juvenile criminologist, Dr Eon Sonnekus, told the court the boy seemed to be made of good human material.

"The accused showed an overall good character and positive attributes for some 15 years and eight months before the crime," Sonnekus said in mitigation of sentence.

"The accused still seems to be made of good human material."

Sonnekus told the court the boy's behaviour in his school life, sport activities and with his guardian family after the crimes were more in accordance with his social behaviour pattern, and the boy could be rehabilitated.