Pain Of The Color Blue (ALTA Fanfiction)

Kataara and Sokka All there life didnt know they had a half Sibling. A brother name Manu Who mother was shunned by southern water tribe. A brother who loved his sibling despite of who there mothers were, Manu did not want them to find out about his relation with them but he will help his family and the Avatar save the word. Manu has a big role to play in Aang life but until then he will travel along side them. But what if one of the two sibling find out his secret? will Manu be hate or loved? will they understand why he wasnt born in any water tribe in the first place? Stick around and read the pain heart of one boy.