According to my research, it has something to do with having boys and girls. First child: Generally, it is passed from father to daughter and from mother to son.

Some universities in the United States have studied that if parents are good-looking, the average daughter will be more beautiful, which means that the daughter will get good genes, but the son will not. Even if parents are good-looking, they may not have a handsome son.

Some children will inherit the advantages of their parents, while others will inherit the disadvantages of their parents.