Winter by Len Deighton

Winter: A Berlin Family, 1899-1945 (Bernard Samson) - Len Deighton

I love just about everything that Len Deighton wrote, but this was one of his best.  It follows a German family for a fifty year period, starting at the turn of the 20th century.  The two main characters are brothers who follow very different paths.  Excellent storytelling from a master of the spy genre.