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The child-parent relationship must be a just institution. A child is not expected to care for an abusive parent.
We did not choose to be born so why should I care about my parents?
Because relationships are often circumstantial, this cannot be an absolute obligation. For instance, if I am adopted, do I owe this to my biological parents?
Or if I am abused, do I still owe it to them?
We are social creatures and must depend on one another for support. Without the role expectations of the child-parent relationship we are less capable.
The parent-child relationship is the root of self-cultivation and political order. The child learns how to act in society and be respectful to others within the family unit. Filial piety is thus a core moral concept.
The role obligations of the parent and the child are implicit. There is no law or dogma to honor one's parents.
"We must receive help from those who know us and our actual and potential faults, as well as our strengths." (256)
We are better at helping others that we know then blindly helping strangers from our perception.
"It is gratitude based on the recognition that we would not be the sort of people we are were it not for that other person and were it not for the fact that we were able to take from them." (259)
We care for our elders because we recognize what they have done for us.
Though evolution pushes us toward kin selection (assuring survival of blood related humans, first), there is no moral requirement to help anyone, including one's parents. It's particularly understandable that one would not help another person who has treated them badly, harmed them, neglected them.
Morality is not objective, as such who are you to declare it a moral obligation? It could be argued to be perhaps ethically preferable, but to say I am obliged to treat my parents well is false.What about a child that is, say raped or beaten by his parents? Why should he treat his parents well?
A child can not escape the child-parent relationship, like a friend can escape his friendship.
Humans have a natural affection towards their parents. It would be inhumane to disregards one's parents.
Kantianism and Utilitarianism hold no differential pull for those of special relations such as family or friendship.