In december 1975 a relative visited the Charles and Gurli Madsen family in Odense. His name was Dan - and he was doing a journalist exame from a university in northern Spain. He came from Idaho - Boise.
Kirstine had a son called Poul - he did commercial drawing for among others Coca Cola. l had a daughter - named Carol - I think. Kirstine had also a daughter - the mother of Dan. As far as I know - Kirstine lived in New York or Florida.
Does this fit in your search ? If so - i hope to hear from you.