Davey is the older brother of Cole Trenton.
Not much is known about Davey, aside from the fact that when Cole was young, Davey had Cole ride on his three-speed bicycle. Cole decided to do a wheelie to impress some girls. It worked out until Cole had an accident and broke his arm.
Cole does not mention his brother Davey outside of this event, and there is no photo of Davey. A family photo of Cole with their parents also lacks Davey. When Cole was thirteen, Davey and Cole's father Edward was murdered by Dean Winchester, because he had transformed into a monster.