" 30. *Appropriate actions are largely set by our social relationships. In the case of one’s father, this involves looking after him, letting him have his way in everything, and not making a fuss if he is abusive or violent. “But what if he’s a bad father? ” Do you think you have a *natural affinity only to a good father? “No, just to a father.” Suppose your brother treats you badly. In that case, maintain your fraternal relationship to him. Don’t think about why he behaves that way but about what you need to do to keep your will in harmony with nature. No one else, in fact, will harm you without your consent; you will be harmed only when you think you are being harmed. So make a habit of studying your social relationships – with neighbors, citizens, or army officers – and then you will discover the appropriate thing to do. "
― Epictetus , How to Be Free: An Ancient Guide to the Stoic Life