With the UK no longer being part of the EU or the EEC I don’t know exactly how they would be able to live in Norway. They might fall under different Visa requirements than previously. Just a thought.

George Like you I had a business in Norway for over 20 years and have been married to a Norwegian girl for over 40 years and like you have a son and 3 grandchildren in Norway. I have a home in Norway and the UK. For many reasons I strongly recommend you hold onto your British citizenship
as once on the ‘system’ in Norway you will be controlled and taxed to the eyeballs. With UK citizenship you will have greater net funds and flexibility.
Wish you well Brian

The U.S. has citizenship-based taxation, which has created a legal nightmare for millions of U.S. citizens living outside the U.S. Which is why U.S. expats are renouncing their citizenship in droves. Each year, the number gets bigger and bigger. Since Norway now allows dual citizenship, you can acquire U.S. citizenship without having to renounce your Norwegian citizenship. But before you apply for U.S. citizenship, you need to ask yourself if you definitely want to live the rest of your life in the U.S. If you think there is a possibility that you will want to live elsewhere in later life, you will be better off never becoming a U.S. citizen.