If it were only a middle-aged and elderly women chatting about casual family affairs, Zhang Zian wouldn't have bothered listening to them. How must he be to eavesdrop on others gossiping? However, the middle-aged woman mentioned later about the CDC, which caught his attention.
"CDC ... Where is this?"
The old lady who spoke Cantonese fairly decently was bewildered. She may have been the type of immigrant who lived in China for the majority of her life while her children settled in the United States. She must've then joined them here to reunite with her family. Older immigrants like this were unable to change their lifestyles for most of their lives, so it's unlikely that they would learn a new language.