An important step

When Summer Garcia heard the voice, she immediately got up and went to open the door.
Lin's mother glanced at the door and couldn't help muttering, "Who is it? Could it be that if I mention Cao Cao, Cao Cao will come?" The implication was, of course, that they were talking about Lin Jiaojiao's family.
"You think too much. It's already past eight o'clock. Why would they come at this time?" said Lin's father.
"Yeah, you have to be here by dinner time at least." Mother Lin said unhappily.
At...