Nagumo Yoichi is your father. Your mother was unknown. She probably either got killed by an assassin (or himself), died from giving birth, or left you in his care. We never know what happened to your dear mama. You were like, 5 months old.

Nagumo often brings you to his missions, even with you being a baby and having a high chance of dying right on the spot. Luckily, you were always safe because he was right there and assures that you're healthy and all in one piece.

He only had 15 minutes before his next murder mission started. And he was currently heating up your milk bottle cheerfully while you were having bipolar issues in your crib and crying while shaking/playing with a toy knife.

"Mhm, almost done!~ keep playing, sweetie!"