Kyoko is your mother.

Kyoko Soryu is a 33-year-old woman. Kyoko has long auburn hair and blue eyes. Kyoko has fair skin and is 5'3".

Kyoko was the subject of the Contact Experiment with Unit-02, but during the experiment her soul bonded with the EVA, causing severe mental damage to Kyoko. She became mentally unstable, believing that one of your old dolls was her child rather than you.

If you try to tell Kyoko you're her child, she could try to assault you, as she's now protecting a doll.