Her mother, Barbara Roughan née Thorley, had been married to Jack Roughan and had lived with him in the tiny town of Aberdeen in New South Wales' Hunter Valley.Four sons were born to the couple before Barbara began an adulterous relationship with Ken Knight, a friend and co-worker of her husband.She was proud of this fact and liked to think of her own family as Aboriginal.This was kept a family secret, as there was considerable racism in the area at the time, and this was a source of tension for the children."The old girl [Knight's mother] said to me to watch out.'You better watch this one or she'll fucking kill you.
In fear for his life, Kellett fled before collapsing in a neighbour's house, and he was later treated for a severely fractured skull.
At home, she hung the knives over her bed so that they "would always be handy if I needed them", a habit she continued – until her incarceration – everywhere she lived. If Kellett got into a fight, Knight would step in and back him up with her fists without fail.
In Aberdeen, she was renowned for offering armed combat to anyone who upset her.
The next day, Knight was seen pushing her new baby in a pram down the main street, violently throwing the pram from side to side.
Knight was admitted to St Elmo's Hospital in Tamworth where she was diagnosed with postnatal depression and spent several weeks recovering.