Mei Mengzhen wanted to butt in and bluntly tell these people that her youngest uncle would remarry and have a son afterwards, so they needn't worry, but she couldn't just say that. After all, Jiang Xiumei was still alive. So she offered simple comfort, "Aunt is still young, capable of having a second child. If she really wants to try for a son, even a third child isn't out of the question."
It wasn't necessarily that Mei Yongfu was so fond of Mei Mengfei; it was more about the traditional preference for male offspring. In the Mei Family, this belief wasn't just limited to Mei Yongfu; her father, Mei Yongfu, was exactly the same. It wasn't that they were particularly fond of their son, but having a son meant you must cherish him and give him everything.