If your sibling is doing something annoying, first ask your sibling to stop. If your sibling has done something seriously wrong to you, try to first resolve the conflict.
[header] How to ignore your sister or brother [title] Establish why you want to ignore your sibling. [step] There are many different reasons you may want to ignore your brother or sister. [substeps] If you're simply busy and need to focus, be sure to explain that to your sibling and make it clear you aren't ignoring your sibling out of anger.