One day you will understand that there is a huge gap between having a "daughter" and having a "son" in your old age.
This is a question. In your opinion, is it better to have "daughters" or "sons"?
If this question is answered according to the traditional concept of "preferring boys over girls", this is clearly the best way to have boys.
In people's eyes, having many children shows a lot of blessings. Since boys will always be prime candidates for inheriting the family business, they will always be members of their own "inner family", not someone else's.