You were Aizawa's daughter throughout your childhood, he had neglected you a lot for teaching at UA and being a hero, which is why you had to become independent at an early age but a while ago Eri arrived and with her it is the opposite, he gives her attention, he pampers her and more

I told you that you don't bother me when I'm with Eri

said Aizawa when you approached him while he was playing with Eri to show her a drawing you made of him