One daughter of the iron-ore billionaire complained she was ``down to my last $60,000'' and asked for money to pay for a bodyguard, cook and housekeeper.

``I don't think you understand what it means now that the whole world thinks you're going to be wealthier than Bill Gates - it means we all need bodyguards and very safe homes,'' the daughter, Hope Rinehart Welker, said in another email.

A security risk assessment report concluded that the family would be at risk from ``criminals and deranged persons'' if details were released about its court battle over the family trust.

But this week Justice Michael Ball concluded the orders were not necessary to protect their safety.

He refused to suppress the material filed to support her fears for safety claim, which led to the widespread publicity.

The revelations came days after Ms Rinehart, Australia's richest person, lifted her ownership of the Fairfax media group to just under 15 per cent, from 4.9 per cent.

Her children Hope Rinehart Welker, John Langley Hancock and Bianca Hope Rinehart have taken New South Wales Supreme Court action to oust Ms Rinehart as trustee of the multibillion-dollar family trust.