TOKYO - Warren Nobuaki Iwatake's family has seen more than its share of calamity. When he was still a child his father was lost at sea off Hawaii. With no breadwinner, his family was forced to move to Japan, where Iwatake was drafted during the war. He lost a brother when the bomb fell on Hiroshima. But through it all one thing has remained constant. The tree. His parents bought it in 1937, and his family has brought it out every Christmas since, without fail, even when that meant risking arrest. "This tree was a shining light, because it was...