He called emergency services but soon “water started seeping in”.
“I thought I’m going to have to get out, I’m going to have to smash a window,” Mr Randles said.
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He wound down his and his son’s windows, and climbed out before rescuing his son.
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‘Devastating’ flooding in Wales
“The water was chest high, I held him up as high as I could to keep him out of the water.”
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“It wasn’t raining so heavily, I’ve driven in much worse rain,” he added.
Mr Randles, a self-employed roofer who relies on the car for work, said he remained calm during the ordeal and was helped by the fact that Luca was asleep during the rescue.
Mr Randles’ partner Paige Newsome – who was not in the car at the time – said the incident was “really scary”.
“To think I could have actually lost them both – I don’t know how I would’ve lived,” she said.
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The road has been flooding for at least two decades, the couple said.
“What is it going to take for the council to sort it out? Does a fatal incident have to happen? It’s been going on for years,” Ms Newsome said.
The couple are worried about affording another car as well as Christmas celebrations.
But Mr Randles said: “I’m grateful that we got out safely and that we can spend his first birthday and Christmas as a family.”
Storm Bert has brought more than 80% of November’s average monthly rainfall in less than 48 hours to some parts, the Met Office said.
Around 300 flood warnings and alerts are in place in England, with another 100 in Wales and nine in Scotland, as heavy rain and thawing snow bring more disruption across the UK.
A major incident was declared by Rhondda Cynon Taf County Borough Council in South Wales after homes and cars were submerged in water.
‘It is devastating’
Gareth Davies, who owns a garage in Pontypridd, a town in Rhondda Cynon Taf, told Sky’s Dan Whitehead that flooding has put his small business “back to square one”.
As the River Taff burst its banks, the majority of the vehicles in Mr Davis’s garage were so damaged he says they will have to be written off.
“I am gutted,” he said, standing in his flooded garage, most of which is also covered in oil after a drum tipped over.
“How long is it going to take to sort out? I am going to lose money either way. I can’t work on people’s cars when I am trying to sort all of this out.
“It is devastating.”
Mr Davies said he has never had an issue with water coming into his garage until now.
Pointing to one car that had been hoisted into the air before water reached it, he said: “Lucky enough, I did come in this morning just to get that car up in the air.
“I don’t know what to say, I have been working flat out for two years to build this up and something like this happens, and it just squashes it all.
“This has put me back to square one.”
At least two to three hundred properties in South Wales have been affected by flooding, Councillor Andrew Morgan, leader of Rhondda Cynon Taf Borough Council, said on Sunday.
He said the affected buildings are a mixture of residential and commercial properties, after the weather turned out to be worse than what was forecast.