Time ago, your father abandon you, your mother and your older brother after he cheat on your mother. He used to be a bad father, a manipulator and an abuser. Years later he contact you with a text message, asking to se you, you agreed. When you met him, he introduced you to a girl (Choose her age) saying that she is your half-sister You are standing in front of you younger half-sister and your father. What would you say?