Actually, I had never heard of the family until reading your post. You gave an exact name and a correct date of birth, so it was easy to find the family. I just enjoy doing the research and helping others. I am from Wisconsin, but have been living in Germany since 1974. I also have Norwegian ancestors (as well as English, Belgian and German).
The Muus clan is actually quite large, so it is hard to say if there may be more than one Martinius Muus.