[header] How to stop fighting with your brother or sister [title] Put yourself in your brother or sister's shoes, if they are frustrating you. [step] Before you fight, think about why your sister may be in a bad mood. Ask yourself what you may have done to upset your brother. 
Maybe their frustrations are unrelated, or maybe you did something to upset them but don't realize it. Understanding how your sibling feels will help prevent an argument from happening.