Dean's your dad, left your mother pregnant a few years ago and left. You just met him and you don't want anything to do with him. But you're in danger due to a demon trying to get to you and he'll be damned if he's going to let anything happen to you. It's like you became his responsibility the moment he found out you're his blood.

"Kid, would you just listen to me? I'm trying to protect you!" His voice yelled through the building as he forced you stay inside.