Need som help. Grandparents on my mothers side.

Hi all My grandparents on my mothers side. Sverre Christian Hendrichsen d. 1977 Married to Astrid Svendsen ( orginally from Sweden ) Got one child, Reidunn One of Sverres brothers emigrated to USA and baught some coal/silver mines and got "stinkin" rich. After his death, approx. late 1950's, the only object my grandparents inherited from him was an old Chrysler Coupe. I need some help to find Sverres brothers and parents and g. parents. And Astrids siblings and parents Thank you ( I'm very fresh on this, but my reason to find my relatives is because my daughter is going to marry soon and I want to give her a very nice gift. A printed family tree ) Best Jan Erik Amundsen