A mother in Australia took her two sons on a late night drive to get rid of their father's dismembered torso, a Sydney court has been told.

The torso, legs and one arm of 47-year-old Revesby man Wayne Robert Chant were found dumped in three separate locations more than 16 years ago.

Joyce Mary Chant has pleaded not guilty to the shooting murder of her husband, but guilty to a charge of improper interference with human remains.

In a police interview played to the jury in the NSW Supreme Court Wednesday, Chant explained how her husband was accidentally shot in a struggle for his gun in their bedroom in September 1992.

Chant, now 57, left his corpse locked in the bedroom for at least two weeks before dragging it outside wrapped in a bed sheet and dismembering it.

She then dumped parts of her husband's body at various sites across the state, but kept his head — which she placed in her backyard — until her eldest son Jamie Chant told her she was "stupid" and to get rid of it.

Jamie's younger brothers Craig and Scott, then five, accompanied their mother on two such trips — one made in the dead of night to a truck stop near Kiama, on the NSW south coast, and one during a trip to their grandparents' home.

"We had driven in my mother's van to, I guess, Wollongong or down that way ... and after a few hours we stopped. It was dark and very late," a visibly shaken Craig told jurors."My mother got out of the car and told me to stay in the car. Once she got out of the car she went to the back and opened the back of the van and I saw what turned out to be (my father's body)."

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