My Brother's Keeper // Supernatural

Sam Winchester was only 4 and a half years old when the fire happened. He remembered that because when his dad told him to take his baby brother Dean outside, Sam was scared, and John told Sam that Dean was HIS responsibility, because HE wasn't 4 anymore, HE was 4 and a half.

This is a Supernatural AU where Sam was born before Dean, and Dean was the child that Azazel chose.