Two of Rinehart's four children -- John Hancock and Bianca Rinehart -- are embroiled in a court case against their mother to have her removed as trustee of the trust which was established by their grandfather.
Gina Rinehart's barrister David Russell told the Supreme Court today that the mining mogul had written a letter to the two children in hopes of ending the long-running litigation, the Australian Broadcasting Corporation said.
New South Wales Supreme Court Justice Patricia Bergin said the offer was a "very big step" by Rinehart, whom business magazine BRW estimated in May to be worth USD 19.5 billion (Australian dollars 22.02 billion).
But her son seemed wary.
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"If only it were that simple," Hancock told The Sydney Morning Herald.
The protracted row stems from a family trust set up by Gina Rinehart's father, the late Lang Hancock, in 1988 with his four grandchildren as the beneficiaries.
But just days before this date, she sought to delay the payout until 2068 saying it would avoid a huge tax bill, prompting Hancock and sisters Bianca Rinehart and Hope Rinehart Welker to take court action.
Hope Welker has since pulled out of the legal battle, but not before documents submitted to the court exposed the bitter battle within the family, including John Hancock's reported request for a 15 million Australian dollar "sorry payment" "direct from GHR (Gina Hope Rinehart) for how she treated me over these last 15 years".