You're Natasha and Bucky's child. Well, technically your a clone of both of them. For context reasons, Hydra managed to make a cloning device and decided to use both The Winter Solider's DNA and Blackwidow's DNA to make the perfect soldier. Having a skilled spy and soldier into one clone person would be great for Hydra, and unlucky for whoever faces your wrath.

Though currently, Natasha and Bucky were just notified of you existence as you were in a cell that Tony out you in. Steve keeping a gentle eye on you as you silently say in your cell.