William Tyrrell’s former foster mother has admitted assaulting another child on two occasions but denies intimidating the victim.

The woman appeared with her partner at Parramatta Local Court on Monday for the start of a five-day hearing.

The two assaults the 58-year-old woman pleaded guilty to occurred on Sydney’s north shore in January and October 2021.

The two counts of intimidation, to which she has pleaded not guilty, involve a series of alleged incidents between January and August that same year.

Her 56-year-old partner, the former foster father of William Tyrrell, has pleaded not guilty to one count of assault and one count of intimidation over alleged conduct in November 2020 and October 2021.

The couple cannot be identified for legal reasons.

Police prosecutors will use statements and alleged threats made in recordings of the foster mother within her home to prove a tendency in her actions, the court heard.

The woman’s lawyer, John Stratton SC, unsuccessfully opposed that plan, saying that if threats to smack a child were criminal conduct there would be offences occurring in “maybe every household in Australia”.

In one of the recordings, a “smack, smack, smack” sound was heard and in another the alleged victim called the woman a “f—— b—-“, the court was told.

The couple had a long-running dispute with the child, who was upset they had brought another foster child into the home.

Threats were made about ending her time in foster custody.

Magistrate Susan McIntyre allowed prosecutors to use the evidence, saying it showed a pattern of conduct.

She also rejected an application by the foster mother to have the remainder of the hearing held in a closed court, adding that existing suppression orders were enough to protect the identity of the child.

In August, police dropped one charge against both the man and the woman of dishonestly obtaining a financial advantage or causing disadvantage by deception.

The couple said they would plead guilty to downgraded charges of procuring another person to make a bid on behalf of a seller at auction, resulting in a fine.

The pair paid a dummy bidder to bump up the auction price of their north shore home in December 2020.

Mystery surrounds the 2014 disappearance of William Tyrrell, who was three years old when he vanished from a property belonging to his foster grandmother at Kendall on the NSW mid-north coast.

Police have consistently sought answers in the years since his disappearance, including conducting a thorough search of the Kendall property in December 2020.

In June, lawyers for the foster mother called on detectives to respond to reports that criminal proceedings were being considered against her over William’s disappearance.

Neither foster parent has been charged in relation to that case, however the mother was acquitted in 2022 of lying to the NSW Crime Commission about hitting another child with a wooden spoon.

The hearing on the assault and threatening charges continues.

– AAP