Tian smiled and sneered. "Tian Feifei, what's the matter with you?" Do you think I'm scarce to ask you to help me? Tell you, I'm not scarce at all. But who let you be my sister? I won't let you help me. Who can I let you help me?

The implication is that it is natural for Tian Feifei to do things for her.

Tian Feifei couldn't say anything. She walked to her wrap, pulled the zipper, pulled the check out, turned around and threw it on Tian Xiaoxiao.

"Tian Xiaoxiao, this is a million, you take it away, I don't want to see you anymore, from now on, your...