Jennifer Mui Len Chin, 49, said she thought the 14-year-old boy was an intruder the night she found him in her home after her daughter had snuck him in for sex. On Friday a jury decided they did not believe her.
Jennifer Mui Len Chin, 49, said she thought the 14-year-old boy was an intruder the night she found him in her home after her daughter had snuck him in for sex. On Friday a jury decided they did not believe her.
By Rebecca Peppiatt
August 9, 2025 — 7.57am
A Parkwood mum who stabbed her daughter’s teenage boyfriend after she had snuck him in to the family’s home for sex, has been found guilty of intending to harm the 14-year-old.
Jennifer Mui Len Chin, 49, pleaded not guilty to causing bodily harm after the boy was left with four superficial stab wounds, claiming that she thought he was an intruder who had broken in and was going to assault her and her children.
The evening tryst from October 2023 has played out in court after Chin took the charges to trial in Perth’s District Court last week.
The court heard how Chin’s wayward 14-year-old daughter had ignored family rules that she could not have a boyfriend or have boys in the house by sneaking the teen in to have sex on her father’s bed.
It wasn’t the first time she had taken the risk, but on October 17 that year, Chin became suspicious and went to investigate in her husband’s bedroom, discovering the boy half naked under the covers.
The court was told Chin started yelling, “who are you?” and “intruder” while her daughter tried to claim he was homeless after his parents had kicked him out.
Chin told her six-year-old son to fetch a knife from the kitchen that she then used to threaten the boy before he ran from the bedroom and tried to escape from the house. But a locked front door meant he was cornered and, still holding the knife, Chin took the opportunity to stab him once on each side of the chest.
The boy turned around and she stabbed him again twice in the shoulder blade.
He escaped with Chin’s daughter who called emergency services. Later investigations revealed the wounds were only superficial.
Throughout the trial Chin maintained the lie that she believed the boy was unknown to everyone in the house and was a threat to her and her children.
But between her conservative Christian beliefs, strict parenting rules and evidence that showed the boy was submissively saying sorry and trying to escape, the jury took just three hours on Friday afternoon to decide that she was guilty of intending to harm him.
She’ll be sentenced at a later date.
Rebecca Peppiatt – is a journalist with WAtoday, specialising in crime and courts.Connect via email.