CHRIS EUBANK JR said a rehydration clause in his contract with Conor Benn has been put in place to avoid a "public execution".
The pair are set for a DAZN pay-per-view blockbuster on October 8, almost 30 years after their dads' famous rematch.
Benn, 25, will have to jump up 10lb from his usual 147lb weight class with the the bout set at 157lb.
Eubank Jr, 32, on the other hand is a career middleweight at 160lb, who has even campaigned as high as 168lb.
The weight disparity has meant the two will meet between the 154lb light-middleweight and middleweight limit.
And due to Eubank's superior size, a rehydration clause limiting him to what he can weigh the next morning has been put in place.
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Although the exact amount was not revealed live on stage as the fighting sons came face-to-face in London ahead of the fight.
And Eubank Jr said: “The problem is, I can’t be 100 per cent on the night. If I’m 100 per cent on the night this is a public execution.”
It is believed both will be penalised $100,000 (£82,000) per 1lb they weigh in over, and if either are 158.5lb the fight is OFF.
Benn has continued to climb the welterweight rankings to build on a first world title shot.
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Eubank Jr meanwhile has grown increasingly frustrated at his lack of championship opportunities.
So he turned his attention to Benn following their fathers' iconic fights in the 1990s.
Eubank Sr won the first epic battle against arch nemesis Nigel, before they controversially drew three years later in 1993.
Benn regards his fight with Eubank Jr as a revenge mission and vows to get one back for his mentor father.
He said: "I'm taking care of the family business."
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