We'll make it right for you
Jason stumbles upon a secret lab where he finds a genetically modified baby, created through a mix of his and Dick's DNA.Afraid that Bruce will take this child from him, he decides to run away and raise her on his own. (With some help of some powerful amazons).
"Jason looked at her, entertaining himself with his favorite game of trying to figure out all traits she had inherited from him. The chin was his, as was the nose. He also liked to believe the black hair was, but that honestly was impossible to say... But those big, blue eyes, had not come from him."