But the sisters say these are not new revelations, despite having sent shockwaves through the Australian literary community. The women say the behaviour was anything but a secret.

For example, in Hewett's poem In this romantic house each storey's peeled, the literary icon writes: "Each storey's peeled / for rapists randy poets & their lovers / young men in jeans play out seductive ballets / partner my naked girls."

"This is not some out-of-the-blue attack on our mother," Kate said. "People have acted like this is big news but [mum] wrote about this constantly. It was all openly discussed with her."

Her younger sister Rozanna agrees.

"I have been telling parts of this story for some time," she said. "The #MeToo movement didn't exist. I [also] told my story at the Royal Commission into child abuse for a session on the entertainment industry.

"We were brought up in a very bohemian environment and some of those experiences were worse than others. Mum really didn't believe in not exposing us to anything. We grew up very fast, very hard in that environment. But there was no paedophile ring. It was just part of that time."

Both women have recently published new books that explore their childhood traumas. Kate has released a collection of poetry through Vagabond Press called Tilt, while Rozanna has published a book of poems and essays through UWA Press called Do Oysters Get Bored? The hybrid work also explores parenting her son, who lives with autism.

Kate said she wanted to stress that the incidents that occurred in her childhood weren't just restricted to the Sydney arts scene. Instead, she said it was part of a larger cultural problem at the time.

"In many ways, it was a very ordinary story," she said. "It was very prevalent. A lot of women have reached out saying they grew up in a celebrity milieu and 'we too'."