The six-year-old devoted Melbourne supporter, along with his dad Mark and sister Jorja, had the last laugh when the Dees took down the Bulldogs during Saturday night's Grand Final in Perth.

While the Harris' celebrated, it was a different tale next-door for the Bradshaws, as Steve and his children Bella, Bodhi and Jett were left heartbroken by the Bulldogs' loss.

They expect to be hearing plenty more from Will in the months to come.

"Young Will gets into me all the time," Mr Bradshaw said.

"He can trash talk me for the next 12 months I guess.

"It's been a long month."

Having been neighbours for the past six years, it's not the first time the two families have experienced the friendly rivalry.

"It goes on all year actually," Mr Harris said.

The end of the Demons 57-year premiership drought has been a long time coming for the Harris', who would have loved to have been in Melbourne to mark the occasion.

"I've been a supporter for as long as I can remember," Mr Harris said.

"Dad and his old man were the same, and mum's a supporter as well."

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While it was a hard night in front of the television for Mr Bradshaw, he still has fond memories of the Dogs' last flag.

"I was there in 2016 and definitely would have been there (the MCG) if I could have been," he said.

"It would have been a long train ride home though.

"It wouldn't have been as good as five years ago."

Steve and Jett have always been loyal Dogs' supporters, while Bodhi and Bella also have a soft spot for Sydney.

The second half was all a bit too much for Bella.

"I went to bed," she said.

The remainder of Will's school holidays will now be spent watching replays of the game, having already started reliving the glory.

However, Mr Bradshaw will be staying away from the TV and his phone.

Now all that's left to do is take their decorations down.

The Harris' joke that if the wind doesn't get to them first, the Bradshaws will.

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