
Go back to when she died, that guy was blond haired blue eyed, and wore a hooded robe. When they show the older brother of Daphne he is blond haired and blue eyed. Plus the only "memories" the father has is a recurring nightmare of what happened. He doesn't show any other signs, and he doesn't use magic. Only Daphne's brother is mentioned using magic.

Yes I'm sure its the mage in the mage tower. As you have seen around chapter 5 at the end ( http://www.mangago.zone/read-manga/actually_i_was_the_real_one/uu/d_chapter-5/pg-13/) you see a man, with blonde and blue eyes and in a hood doing magic. He was reversing the time. Those same feature's are then seen again with the lady teaching her about the gatherings ( which i believe is his mother ) and again around chapery 26 when the other lady ( which i believe is his sister) is helping her with the social trends ( http://www.mangago.zone/read-manga/actually_i_was_the_real_one/uu/d_chapter-26/pg-15/) . Its seen that her brother the mage has blonde hair and blue eyes , also his a mage , the father doesn't even use magic. So I doubt that it's the father, actually there is no way its the father.
Okay, so I find it odd that no one is questio8 if maybe her father just isn't very good at showing his emotions, and that maybe the little blond cunt and her family used that to cast a spell onto the Grand Duke, and make him act like he did. It seems to me that his reaction to his dreams of killing his daughter is extreme for a man that doesn't care about her. Yet he seemed to get colder and colder and believe more and more of what the blond bitch said as if he were under a spell. Plus he doesn't seem to want his daughter dead, now, but over the course of a few short months he suddenly wants her dead? I mean the man has issues, I'm not disputing that, but there's nothing in his actions now that says that he hates her. In fact her change in behavior seems quite alarming to him. This would not be the case if he truly hated her like her first life seems to have implied, so maybe he was under a spell a s well. And the older brother of the girl with pigtails is the one that turned back time. I'm sure of it.