Nevertheless, the 56-year-old Finn still enjoys having the occasional laugh at his son's expense.
When asked how Artturi has changed since joining the Habs, Ismo's reply is just about as good as it gets.
"He's starting to be a man," cracked Mr. Lehkonen. "In a couple of years, he'll start to look like a professional hockey player."
Enjoying the Montreal experience
The Lehkonens attended their third straight game at the Bell Centre on Monday night, and will be in attendance again on Wednesday night against the St. Louis Blues before heading back overseas.
Ismo has also spent his fair share of time at the Bell Sports Complex in Brossard watching practices as well.
Hockey aside, enjoying the sights and sounds of Old Montreal is always a highlight.
"I like to walk, two or three hours a day," said Mr. Lehkonen. "I'm trying to learn this city and I'm walking all over."
The best part of the couple's trip to Canada, though, is simply watching their son play the game he loves - and stay healthy as the season rolls on.
"Last season, it wasn't so easy to play at this level when you have that type of injury that Arsi had and you're struggling every single game," explained Mr. Lehkonen. "Now, it's a different story. You can see it in his face. He's laughing and having fun."