Joseph Parker's younger brother John has been named to fight in the undercard of his heavyweight unification bout against Anthony Joshua.
John, 23, said he is humbled with the opportunity and is looking forward to being in his brother's corner for the super fight.
"Joseph has always been there for me in boxing and I have always been there for him," said John.
"We've always helped each other and we have always had that love-hate competitive relationship.
"Anything that I can do he says he can do better."
John is a cruiserweight fighter and has three wins under his belt.
"I will be in his corner (Joseph), I'm not expecting him to be in mine - if he is then even better. I know this fight is important and I don't expect anything from him more than the win," said John.
"Mum and dad love it whenever me and Joseph are together because they know that we are bit more tame when we are with each other."
John's trainer Bryan Barry the brother of Joseph's trainer Kevin Barry, said it is crucial John comes away with a win.
"It's really important that John sets the tone for the night, it's important that we get the night off to a good start for Joseph," said Barry.
Parker and Joshua are set to face off on April 1 in Cardiff, Wales at Principality Stadium.
Kiwi heavyweight champion Joseph Parker is sticking to what he knows best, hitting the road with an early morning run in Las Vegas as he prepares for his unification bout with Anthony Joshua.
Sky Sports UK joined Parker and his trainer Kevin Barry this morning as he was preparing for a run.
"Training is going really good, everything is on track," said Parker.
"We've got a good structure and good plan going into camp.
"Everything is all good, everyone is happy - just got to put in the work and prepare for March 31."
Barry believes there is nothing better for building up a boxer's cardio than traditional training like running.
"Joe loves his road work and this is something that we have always done the five years that we have been together," said Barry.
"Most mornings he's up at 5 o'clock preparing himself in his room, he has a little bit of fruit and 5:30 he is on the road.
"He usually runs five miles in the morning (8km)."
Barry has criticised Joshua's new and technical training regimes, saying it will not help with the British champ's aerobic fitness.
"I see videos posted everywhere of him (Joshua) doing the most sophisticated, new age training methods that man has ever seen and yet he's looked very tired in his last couple of fights," Barry told Sky Sports UK.
"Every time he's been asked to go on to the later rounds, he's really struggled so that's a question for his training staff.
"He wouldn't want to be slowing against Joe, because I can promise you this. Joe will be coming on in the later rounds."
Parker and Joshua will take on each other at Cardiff’s Principality Stadium on April 1 (NZ time).