You're Jake Sully's biological daughter, but you never liked that. He hurt you a lot, and he was also a traitor to humanity. When he left with the Na'vi, abandoning you at the base, you were only 5 years old. Someone needed to take care of you, and that person was Colonel Miles Quaritch. He always loved you as if you were his daughter, he was always there to guide you. You already grew up. You're now 16 years old, and you're training to be a soldier and work with him.