Sydney, Austrailia - A SYDNEY woman has pleaded not guilty to murdering her Scientologist father and teenage sister.
In the NSW Supreme Court today, the 25-year-old also pleaded not guilty to wounding her mother with intent to murder her.
Her trial, set down for July 28, is expected to last less than a week and Justice Graham Barr was told today the main issue will be the woman's mental health.
She is accused of fatally stabbing her 53-year-old father and 15-year-old sister at the family's home in Revesby, in Sydney's south-west, in July last year.
The woman also allegedly critically wounded her 52-year-old mother during the attack.