Like it or not, the act of bearing a child creates a very different relationship between a child and a mother. You are forever changed physically, mentally, and emotionally after having biological children.
I think you are ignoring the bonding that occurs with the father. He is the provider and there is a drive to take on this additional responsibility.. instead of buying that new sports car. Here is an interesting question: who is more protective of the daughter with respect to her first date… mother or father?