Katarra and Toph thou not blood, they make great sisters. And in reality that's the relationship of most sisters. At least it is for me and my sisters. We can have the ugliest fights and the sweetest reunions.
General Iroh, The Dragon of the West, Head of the White Lotus and the best tea maker that there ever was. Uncle to Zuko and Azula and brother Ozai. Brother in law to Iyla and is an excellent Paisho player