Ken Follett's historical epic entitled The Century Trilogy:

 
The first book of the trilogy, Fall of Giants, takes place at the time of WWI, the Russian Revolution, and the fight for women’s suffrage.  Five families from different countries, interconnected through relationships, become embroiled in the national causes of their countries.  Often members are on opposing sides of the issues and even of the battles of war.  Winter of the World, the second book in the trilogy picks up right where the first book left off, as its five interrelated families—American, German, Russian, English, Welsh—enter a time of enormous social, political, and economic turmoil, beginning with the rise of the Third Reich, through the Spanish Civil War and the great dramas of World War II, up to the explosions of the American and Soviet atomic bombs. The third book, due out in 2014 and provisionally titled Edge of Eternity, will be about the next generation during the Cold War.