Amy, a Continental Giant rabbit, was four feet long and weighed a whopping three stone before her death in May 2009.
But Ralph, one of Amys 32 babies and barely a year old, is already longer and heavier than his monstrous mum and weighs more than the average three-year-old child.
Owner Pauline Grant relies on handouts from neighbours to make sure Ralph does not go hungry by chomping his way through £10 pounds worth of food a day.
He munches his way through half a cabbage for breakfast and dinner as well as feasting on a handful of carrots and apples for lunch.
Mrs Grant claims he is too heavy for her to pick him up for cuddles and relies on helpers at the Sussex Horse Rescue Trust, Uckfield, East Sussex.
"He is just so big. You do not fully realise until you pick him up and he has quite the appetite," said Mrs Grant.
It really hits us in the pocket having to feed him but thankfully Ralph is so famous in the area people stop me in supermarkets and offer to fit the bill.
I have no idea how big he is going to get, it could be a ridiculous size but everyone loves him and he laps up the attention.
Ralph's dad Roberto is also a previous record holder for the worlds biggest rabbit after weighting in at 35lb and measuring 3ft 1inches.
Mrs Grant is waiting on Guinness World Records to confirm Ralph as the biggest in the world after they changed their rules on measuring animals for size.
TV medium Derek Acorah, star of Most Haunted, has even had a meeting with Ralph after believing the reason he had grown so big was because he was possessed.
"We are pretty sure our house is haunted by something or other, so Ralph went up to London with friends of ours to meet Derek Acorah," said Mrs Grant.
"They said it was pretty spooky and he had a good old chat with Ralph about the spirits in our house. He seemed to think Ralph was channelling the spirit of a ghoul.
"It sounds like a load of old nonsense but Ralph isn't your average rabbit."