From his single mother who is white and a blonde, I'd wager.
EDIT: That was her in the video posted above, right?
She is visibly First Nations, and not White, according to how those are defined in Canada.
We can presume that she must have Swedish ancestry on her father's side. They mention her mother is full Cree.
I’m even more impressed with him if he’s managed to get to where he is with a single mom. That is no mean feat in the upper echelons of hockey. The last player drafted high with a single mom that I can even think of was Tyson Jost. I was raised by a single mom myself.
It's becoming very rare in general for anyone from a low income background to make it this far. You can't just play ice hockey outside anymore, you need to train for most of the year and you need help from trained coaches and skill trainers to rise above your age group. Cayden would have had to persuade a lot of people to help him with that support.
It's also becoming rare for players to emerge from tiny remote towns, where there isn't any advanced training. Lindstrom is from Chetwynd, a town of 2,500 people, about two hours northeast of Prince George in northern British Columbia.
It all tells us some things about Cayden. One is that you can see where he gets his lack of pretension from. You can tell that he's a small town kid. Another thing is that it's impressive how he's developed such a great base of skills and has such great details for the game, coming from a background without early skills training. He'll be playing in the NHL mostly vs kids who had skills coaches from a young age.