Alaia was her name and it indeed meant to be always happy and joyous. So when she asked Rex in her pitiful state, what could he say to her?
In fact, his mind was completely blank right now. He could feel his blood boiling after hearing that entire thing.
"You should have filed a complaint and should have told your Grandma…", Rex said.
She continued to cry as she said, "Grandma is old…"
"I don't want to give her trouble."
"She has high blood pressure and sugar…"
"She had already suffered from one heart attack and if she were to hear this, she would die…"
"I don't want to lose her…"
"She is the only one I have left.", Alaia continued to weep.
A few minutes ago, he mentioned that he would be her brother and with that, she was his sister. If his sister were to be harmed, then how could he sit back and watch?
Moreover, even as a human it was common sense to get angered by what had happened.