With time travel stories, I’m a bit hesitant to condemn someone for things they had yet to do. So far, the father’s only sins are being cold to and being neglectful of his daughter. He has yet to be lied to and manipulated by the false daughter and he has yet to execute his own daughter who, even if she really was fake, is obviously innocent in this entire situation. Then I remembered that he didn’t even check up on her after she threw herself down the stairs, so... he can just go straight to hell.