Deon Steenkamp, his wife Christel and their 14-year-old daughter Marthella were murdered on their Naauwhoek farm near Griquatown. Photo: Supplied

Kimberley - A 17-year-old boy has been found guilty of all charges relating to a triple murder on a farm near Griquatown.

Northern Cape Judge President Frans Kgomo delivered his judgment on Thursday morning.

The boy was accused of the murders of Northern Cape farmer Deon Steenkamp, 44, his wife Christelle, 43, and daughter Marthella, 14.

They were shot dead on their farm Naauwhoek, near Griquatown, on April 6 last year.

The teenager also faced a charge of raping Marthella and defeating the ends of justice. - Sapa