It's not all in the genes...
Just because a woman can have a child biologically does not guarantee that she will become a good mother. Many child abusers actually are mothers too. They play hot and cold with their children which produces anxiety. Some mothers are such attention seekers that they use their children to fuel their own hypochondriac tendencies by giving them treatments or saying they are sick when they are not.
Some parents are sick in the head... They don't deserve the children that they have. A sign of a sick parent is one that can't even admit that they are wrong. How sad that a person has to be so right that they are willing to sacrifice the physical and mental health of their child in order to achieve an outward appearance of artificial piety. And how sad when someone you care about chooses to marry the wrong person: Someone who only cares about money and looks because that is how superficial they really are.
Outward beauty can draw in but unless the inward beauty is there don't fall for it. Don't fall for outward beauty when the person has a bad character. A bad character doesn't care about the well-being of a child. A good mother will always want what is best for the child and can recognize when they are not it. But a selfish mother will not.