Mario, who had nine points (four goals, five assists) in 52 games with the Arizona Coyotes, is making his national team debut.
Together.
"It means a lot," Mario says. "It probably means the most to my dad. He's the proudest ever. When he called, he said he saw us in the lineup and had tears in his eyes. It's pretty cool. When you think about it, it's eight years difference between us. I've been trying to teach Adrian growing up everything I know. I remember the first time he was skating. Now we're on the ice together for the National team. It's pretty amazing.
"It's a pretty cool story, I think. We took different paths to where we are right now. It's very cool."
The brother, naturally, echoes the sentiment.
"I think it's even more special for our parents," says Adrian, who had eight points (two goals, six assists) in last year's event. "When we grew up, they did everything for me and Mario and we both made it this far. It's pretty awesome. I think they're very proud of us.
"I think they're really excited for us."
There's plenty of reason to be.
It's been quite some time since the duo has suited up alongside each other.
Adrian, just 17 at the time, suited up with MODO of the Swedish Hockey League in 2013-14. Mario was just finishing up his last season with the club.
"We played one game together on the same line," Mario recalls. "We had a really good time together, just clicking on the ice. We click good off the ice. I know where he's skating. He knows where I'm skating. It was so fun playing together.
"It was unbelievable."
So long ago, in fact, that they've been more recently, more frequently, on opposite crews.
Adrian, 22, now with the Kings. Mario, 30, now with the Coyotes.
Both were in the starting lineup at Gila River Arena in Glendale, AZ just a few months ago.