Father spends some time with the child and as soon as it goes to school, he things the child will learn every thing there. He is spending most of his time in earning (which is necessary) but fails to spend more time to the child until he or she is about 17-18 giving the child that he or she is protected by the father and loved. If the father prefers one child over the other (statistics shows that bias), the child is alianated by may not rebel.
In later life it takes revenge in different form and when the father is old, he pays a price. Father gives the moral and physicazl protection and when he fails, the child pays a price and may turn out to be a narcissist and ruin his or her marriage etc. So, making sure that the child feels loved and stress free is not in many cases part of the father's duty. He just gives his 23 cromosomes and done with it. About 10-15% fathers really become part of the child and make sure they turn out to be loving parents themselves.
