Irah, the first daughter of Zuko and Mai. She has two other siblings, a younger sister named Jade and a younger brother named Lee. Her cousins, Soza and Blu {Soza's a girl, Blu's a boy}, are Azula's children. Because Irah is the first born, she was in line for the throne. But, when she fell in love and married a waterbender, she was demoted, because the fire lord's spouse must be native to the fire nation. So her younger sister Jade, who was not a bender, became Fire Lord.