[header] How to get your siblings to clean their mess [title] Approach your sibling calmly. [step] If you want to confront your sibling about the mess they are making, you should approach them calmly. Many siblings make the mistake of trying to fight or argue to get their way. 
Your sibling will be much more willing to help you if you speak to them calmly and in a friendly manner. [substeps] Also make sure you're not approaching your sibling at a bad time.