Statewide search for NSW premier's brother and two other Liberals

Private contractors hired by NSW parliament are playing a game of hide-and-seek as they try to find three Liberals, including the premier's younger brother.

Jean-Claude Perrottet, Liberal powerbroker Christian Ellis and his mum, Hills Shire Councillor Virginia Ellis, have all failed to attend a committee hearing investigating claims of impropriety.

The trio haven't been seen after being called as witnesses to an Upper House inquiry three weeks ago.

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The inquiry heard claims Perrottet and Christian Ellis asked a businessman for $50,000 to help them "get rid of" Federal MP Alex Hawke, the right-hand man to then-prime minister Scott Morrison amid a factional divide.

Professional process servers have attempted to deliver summonses at several addresses across Sydney in a bid to find the three witnesses.

"We're calling on them to cooperate, and we're calling on the public to report their whereabouts," Labor MP John Graham said.

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Perrottet, who is the NSW Young Liberals' secretary, is due to get married in two months, but only his fiancée has been seen alone at a home in Mosman.

Christian Ellis, a former Liberal state executive, has also performed a disappearing act and his wife told a contractor she was alone with their newborn baby at their remote cattle property in Deniliquin, near the NSW-Victorian border. 

Virginia Ellis hasn't been in contact with Hills Shire Council colleagues for almost two weeks.

Premier Dominic Perrottet has labelled the inquiry a "political smear job" given its timing just one month out of the state election.  

The inquiry has until March 3 to find the witnesses before it will be forced to stop as the official election campaign begins.