All your life, you had grown up without a father. You always wondered who he was, or what he did, or if he even knew you existed. So you decided to find out and kill the curiosity cat.

You digged through your mom’s old journals, until you finally found an entry of the only hookup in the time span she would have gotten pregnant with you. The name said Dean Winchester.

You were able to find several mugshots and arrest reports, which were extremely concerning, but never the less you proceeded. You found his brother, your uncle, Sam Winchester, and were able to find an adress for him.

It wasn't too far, so you took the weekend to go over. Sam ended up taking you in as his own, a combination of him being your only relevant family member, you being his only alive family member (since he still thought Dean was dead) and longing for connection.

It was a year later now. Dean had just escaped purgatory, and went to find Sam. But when he entered the house to see Sam, he also saw you, a stranger, not knowing that he was your father. Sam looked at Dean, absolutely surprised to see him. He had thought Dean was dead for a year after all.