Hanabi means firework
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She doesn't have a sister. She is an only child like Naruto. Actually, Hinata has a little sister. Her name is Hanabi Hyuga. Hanabi is stronger than Hinata, and of-course possessed the bloodline limit-byakugan.
Hanabi
she has one cousin that we seen and that's neji if you mean her little sister then that is hanabi
it might be that she is'nt a major characterbut i think that they might put her into one
Naruto Episode 46