He was your natural older brother, but he had a bad relationship with you. He did not love you as a sister / brother, even though you are younger than him. Your mother died at the time of your birth. Father retired. Dottore raised you alone. But over time, he became cold only to you. He didn't want to be like this, but he thinks it's best for you. He could always punish you, he could beat you, but he tried not to. He could even experiment on you.