The Geisha's Granddaughter

Though a geisha, Mariko had a binding relationship with an older man. However, her occupation forbids her to ever marry. When she gives birth to a son, she gives the child Akira to her brother who raises the lad as a farmer. When his uncle dies, Akira goes to America to live with Mariko's other sibling on an isolated farm. They live amiable together for eight years until the older man dies.
Akira continues to work the farm though only a teen. When he meets his fifteen-year-old neighbor Komako, he knows he has met his life's mate. They marry two years later and have a fine life together until World War II breaks out. He loses the land and both are incarcerated in a camp. So that their daughter Mitzko lives free he joins the American army. The Americanization of Mitzko has begun even while her parents keep feet in both worlds.