I don’t have a quick answer to your question but as someone who was born in America with a family that celebrates our Scotch-Irish heritage, I have a view/opinion on this topic that might be of some use to you.
The way I see it, people have two types of heritage, ethnic heritage and cultural heritage.
In my long winded explanation, Norwegian is your ethnic heritage, ethnic heritage has to do with your family and where they come from. The best way I can describe it is, a blend of where your family originated from plus the traditions that they still hold on to. Ethnic heritage is more rigid and unchanging.
Cultural heritage is more flexible, it’s influenced by where you grew up and where you currently live. It’s influenced by your friends and the types of media or leisure activities that you all enjoy.
Caveat: This is just an opinion that I’ve been toying around with, it’s not a fully fleshed out idea that I have any empirical evidence to back any of this up. I am open to constructive criticism that will help hone this mess of ideas into something more poignant.

I feel seen. Been with my partner for over 10 years and I feel the same way as the dad in this text exchange.