10/03/2017 10:24 AM AEDT | Updated 10/03/2017 12:59 PM AEDT

Rod Culleton's Replacement Finally Announced: One Nation Gets Another Senator

And it's staying all in the family.

Fairfax Media
Rod Culleton has officially been replaced

One Nation is back to four representatives in the federal parliament, as the High Court officially named the replacement for rogue former senator Rod Culleton.

Culleton, who was elected on the One Nation ticket in Western Australia in the 2016 election, later defected to become an independent and was then ruled as having been invalidly elected due to a larceny charge on his criminal record.

After a long run of disputes and appeals, during which Culleton was officially removed from the Senate, the High Court finally ruled on Friday as to who should replace him -- and as expected, it's actually Culleton's brother-in-law, Peter Georgiou.

Georgiou was second on the One Nation ballot, and the court ruled that with Culleton removed from the running, the next person on the party's ticket should take the Senate seat. It brings One Nation's contingent back up to four, with the new WA senator to join his partymates Pauline Hanson, Malcolm Roberts and Brian Burston in the upper house.

Hanson herself has already welcomed her new senator to the parliament.

We may not have seen the end of Culleton, however, as he had previously hinted he may serve as the chief of staff for Georgiou. Georgiou has previously said he'll support One Nation in the Senate.

"Peter has worked in the electrical contracting industry for 24 years and has run a successful small electrical contracting business for over 16 years," Georgiou's bio on the One Nation website reads.

"Knowing small businesses are the largest employers of many Australians, Peter understands changes that need to be made to safeguard this national treasure. These safeguards include regulations and intervention changes so that these Australian workers have a secure and well-paid jobs."

More to come.