When your parents leave you in charge.
When your sibling takes your seat.
When you're sick of being in your sister's shadow.
When you're being mean and your dad walks in.
When you're allowed to drink soda but your younger sibling isn't.
When your mom tells you if you lay another finger on your sibling, you're going to be in trouble.
When you tell your sister she can watch whatever she wants and she chooses The Princess Diaries.
When your younger sibling challenges you to a game you're really good at.
When your parents ask your sibling why they can't be more like you.
When you're not the only child anymore.
When your parents try to break up a fight between you and your older sibling.
When your sibling gets busted for something you did.
When your sibling drops the f bomb in front of Mom.
When you're on the couch and your younger sibling is in the kitchen.
When you play a little too rough with your sibling and you beg them not to tattle.
When your older sibling partied a little too hard the night before.