World title hopeful Tim Tszyu has detailed why the Australian boxing blockbuster of all blockbusters will never take place.
Tszyu versus younger brother Nikita, a stadium sellout that every pugilistic fan would pay to see.
But Tszyu has categorically ruled out ever squaring off with Nikita as the unbeaten siblings prepare to feature on the same card for the first time on Sunday.
Tszyu will fight American Tony Harrison for the interim WBO super-welterweight strap at Qudos Bank Arena after Nikita faces fellow Australian Bo Belbin in the same division on the undercard.
The double act is another chapter for the family history book so far dominated by tales of their legendary father Kostya, a former unified world super-lightweight champion.
Tszyu, 28, is not only convinced he'll join his father as a world champion with victory over Harrison but also believes 26-year-old Nikita will one day follow suit, making their family the most successful in the sport's history.
Just don't ever expect Tim (21-0, 15KO) and Nikita (4-0, 3KO) to ever take each other on - beyond their ever willing sparring sessions.
"He's family, man. Family values before anything," Tszyu told AAP.
"We just wouldn't do it. Me and Nikita wouldn't do it. We spar against each other but we wouldn't fight against each other.
"Because when you fight, you go to war. It's war to war and war is not needed in the family. Peace."
Having cleared that up, Tszyu chuckled when predicting how a fantasy fight between the two would go down.
Tszyu is known as the "surgeon" for the methodical way he breaks his opponents down, with all-action Nikita dubbed "the butcher" for his manic style.
"It would be a war, man. Nikita would try to walk me into shots and I'd try to smack him in the body a few times," Tszyu said.
"Of course (I'd win) Who do you reckon?"
Nikita tends to agree, saying his big brother can be terrifying in the ring.
"It's hard to come forward against Tim," Nikita said.
"I remember the last time we sparred, any time I'd crack him with a clean shot, usually you'd see your opponent move back and go for a little bit of a recovery.
"But that kind of fired up something inside of him and pissed him off. He was coming forward straight away so I was always like hesitant to hit him hard, or try and get him again because it was scary. It's honestly terrifying.
"He'd just destroy me. I'd get like one clean shot in and then I'd cop like 10 or 12."
Sharing a card with his brother on Sunday is more Nikita's cup of tea.
"This is going to be a milestone moment for us," he said at Saturday's weigh-in.
"A memory that we'll share for an eternity."