The brother and sister heard their dad's words from outside the door and were very shocked. It turns out their aunt was always like this.
They were third graders, so they could understand what adults were saying.
Dad's implication was that their mom died because of their aunt.
The sister pulled her brother away, stopping him from rushing in.
"Why are you pulling me?"
"What good would it do to go in now? We still have to live together later. Aren't you afraid she'll treat you badly?"
"But I can't help it."
"Just hold it in. It's all my fault for believing what she said."
"It's not your fault. I agreed too."
"Brother, we must not let her have a child. That boy in our class, Xiao Lin, is ignored and not allowed to go to school because his stepmother had a brother."
"So what do we do?"
"Tell Dad, let Dad know. Dad is so good to us, he will definitely listen to us."
"Okay, I understand. Tomorrow morning when Dad takes us to school, we must tell him."
