Lindholm - whose mother, Jill, is the sister of Jarnkrok's father, Tony - always knew Calle had the right stuff.
And believe it or not, this isn't the first time they've played on the same professional team.
A 16-year-old Lindholm broke into the SEL (now the Swedish Hockey League) in 2011 - and the following season, played on the same line as Jarnkrok, who led their Brynas IF club in scoring.
"Obviously, he was a super talent when he was growing up," Lindholm said. "I always looked up to him because he was so good.
"It was a lot of years ago, but we had some success. Obviously, it was a dream come true to play him with and now, to be able to do it in the NHL is pretty cool."
Jarnkrok had 42 points (13G, 29A) to lead Brynas in 2012-13, with Lindholm sitting third in club scoring, 12 points back, as the youngest player on the roster. Today, 5-foot-11, 186-lb. Jarnkrok is a steady, two-way presence, and had 26 points (12G, 14A) in 49 games with the Kraken before the trade.
The three buddies are relishing this once-in-a-lifetime storyline.
But, as Markstrom explains, there's more to it than a golf or 'padel' partner.
They're here to win.
"We've been here… I think, everybody, close to 10 years," Markstrom said of their NHL careers to this point. "We're older now and things have changed.
"It's not like it was when I played in Sweden and these two played in Sweden and we were kids. You're grown, you have girlfriends and kids, and it's more a mature relationship.
"It's not as youthful and as playful now.
"We're here to play hockey and I think everybody has the mindset of a winner, that we all want to win hockey games. When it comes down to it, I think everybody is going to be really professional.
"Obviously, it's nice to get (a new) addition, a couple nice dinners, and to throw another credit card in the hat on the road, too.
"It's going to be good."