The matter of Chen Feng living together with Wu Mengting is known to Zhao Xiaolan.
However, Chen Feng specifically told Zhao Xiaolan that he is just living with Wu Mengting, and there isn't really anything between them.
Yet, Zhao Xiaolan probably wouldn't explain it in such detail to her sister-in-law, Chen Xiaoxia.
Moreover, Zhao Xiaolan has already acknowledged Wu Mengting as her daughter-in-law, and by mentioning Wu Mengting living with Chen Feng to her sister-in-law, she aims to create a fait accompli.
Chen Feng is well aware of his mother's intention. Just like the last time during Aunt's birthday celebration, she brought Wu Mengting along, introducing her to almost all the relatives on her side.
Therefore, Chen Feng really didn't want Wu Mengting to meet and get familiar with his aunt.
