Salim Mehajer's solicitor sister Zenah Osman has been struck off the roll of lawyers for attempting to mislead the Federal Court, in the latest legal drama to befall the Mehajer family.

The NSW Civil and Administrative Tribunal found on Wednesday the case for removing Ms Osman from the roll was "overwhelming" and there was "no evidence" she had learnt, or changed, from her mistakes.

Zenah Osman pictured with her brother Salim Mehajer.

A three-member bench of the tribunal found Ms Osman told the Federal Court in July 2014 she acted for a number of creditors of her brother's failed company SM Project Developments "when she knew or ought to have known that was false".

At the time, Ms Osman was the director of the Mehajer Legal Group, which employed no other lawyers and shared an office with Mr Mehajer.