Twiggy enters Rinehart family feud

Billionaire mining magnate Andrew 'Twiggy' Forrest is now involved in the court case between Gina Rinehart and two of her children over a massive family trust.

Mining magnate Gina Rinehart is Australia's wealthiest person and is also the highest-ranking Australian on the Forbes 2012 rich list, placed at number 29. (Getty)

Ms Rinehart was due to face allegations in a NSW Supreme Court today that she engaged in serious misconduct over the lucrative trust, which was established by her father Lang Hancock in 1988 with her children as beneficiaries.

She has consistently denied the claims.

After a court adjournment today Christopher Withers, the lawyer for Ms Rinehart's children John Hancock and Bianca Rinehart, said they needed more time to work out who would take over as trustee.

Mr Withers told the court that Mr Forrest would file an affidavit tomorrow supporting John Hancock as the trustee.