There was more than one child in the family, and Wei Wei had to go to school. Zhai Hua, who had no experience in taking care of children, truly thought that the family needed someone to help out with child-rearing at home. Without her, her parents-in-law and sister-in-law had been unable to manage the children. That was why Jiajia had gotten sick without anyone's knowledge.
But when Zhai Hua returned, she realized that that was simply not the case.
Since Wei Wei was already in school, apart from fetching him to and from school, the three adults were all free for the rest of the time while Wei Wei was in school. She alone was able to take good care of Jiajia, much less three people. There was no reason that not a single one out of the three adults had been able to detect Jiajia's illness while Wei Wei was not at home.
