TWEED MP Geoff Provest said that allegations being outlined in a corruption hearing in Sydney were 'upsetting'.

An Independent Commission Against Corruption hearing is underway looking at former Labor Minister Eddie Obeid's family purchases of land at Mount Penny.

The commission is looking into whether the former NSW Labor ministers leaked information about potential coal mining leases to the family.

"At the moment there are a lot of allegations," Mr Provest said.

"I'm always upset when allegations like this surface because it affects us all.

"There are a lot of hard working politicians on both sides of government."

Mr Provest said he had followed the enquiry through the media and was 'amazed' at the allegations.

The last phase of the commission enquiry into the granting of coal mining licences in NSW, angry rebuttals and awkward silences from Mr Obeid have followed suggestions his family stood to gain millions from mining tenders approved by his colleague, former Labor Minister Ian MacDonald.

During one of many fiery exchanges with counsel assisting the commission Geoffrey Watson, Mr Obeid was threatened with contempt of court and warned he needed to answer the questions directly.

He has denied having any knowledge of how confidential zoning maps landed on the tables of his family's offices and claimed he was unaware two of his sons were buying properties which fell under new tender agreements.

On Tuesday, NSW Greens MP John Kaye called on Premier Barry O'Farrell to apply to the Supreme Court for an order to freeze Mr Obeid's family assets.

The Premier will also consider whether mining licences at the centre of the scandal should be suspended.