The trio -- twice World Player of the Year Beauden, fullback Jordie and lock Scott -- created history last June when they all started a test against France at Eden Park and all three look likely to be in the World Cup squad later this year.
McCaw, who grew up on a farm and is no stranger to running around on frosty mornings himself, said it was the willingness of the three to just go that bit further and put themselves under pressure that helped earn them the famous black shirt.
"It's often the character, when the heat comes on, whether you're prepared to do all those extra little things, sometimes you can't teach that," the captain of the 2011 and 2015 World Cup winning sides told CNN's World Rugby on Thursday.
"Those boys have got all that from their upbringing, but they work extremely hard and they're grounded.
"The recognition hasn't gone to their head, they just keep doing their bit for the team, which I guess is the ethos of what New Zealand rugby is all about."
The trio's elevation to the national side may not have been a huge surprise to their father Kevin, a former Wellington Hurricanes and Taranaki lock, who famously quipped when he retired that he was "going to go breed some All Blacks".
The brothers were raised with five other siblings, inheriting their size from their father and speed from their mother Robyn -- a talented basketball and netball player.
Despite their father's tongue-in-cheek quip, Jordie said there had never been any pressure on them to succeed as rugby players.
"I honestly can't remember a time where Dad said 'go train' or 'played poorly on the weekend' or 'why weren't you doing this?," the 21-year-old told CNN.
"I think that the only thing that mum ever forced us into doing was dropping us off at the top of the road and, grabbing our school bag, she'd give us a pair of sneakers and say 'run home'.
"It's always just been us wanting to play with our mates and compete."
The trio had plenty of friends and family members to compete with on the farm at Pungarehu in coastal Taranaki, where a large back yard had goal posts which in the summer catered for cricket.
"Certainly helped just having acres and acres of green grass ... where there's goal posts and plenty of siblings and cousins around to compete with and play against," said Beauden.
The 27-year-old flyhalf said he was encouraged by his mother to roam around in bare feet unless it was Sunday, when they went to church.
"Our feet were pretty tough back then," he said. "I couldn't do that today."
(Writing by Greg Stutchbury; Editing by Nick Mulvenney)
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