The Other Half (Naruto Sister Fan-fiction)

16 years ago, on October 10th, the destruction of the Leaf Village began – the Kyuubi was released from its vessel; Kushina Uzumaki, destroying countless buildings and ending hundreds of lives. On that day, though, two new lives were brought into the world as the new vessels to the Kyuubi: Naruto and Yukiko.
Yukiko was abducted at birth by the attacker of the Leaf Village, a masked man, and taken back the Akatsuki, where she has lived for 16 years believing she was adopted by her ‘mother’ Konan. The existence of the second Uzumaki child is unknown by the rest of the village, a secret buried along with her parents