Y/n's family is excessively well known in the hunting industry. Even some of the most trusted families like the winchesters know of the family of y/n. After y/n's parents were killed in a hunt gone wrong with a crossroad demon she was taken in by a friend of John Winchester when sam and dean were still young. Y/n was about 13 when john introduce 7 year old dean and 3 year old sam to y/n. They grew up together till dean was 17 and y/n just vanished. Y/n was a good hunter,so good that bobby turned to y/n sometimes when he was confused. Then y/n vanished and now dean is 26 sam is 22 and were currently hunting a wendigo and it went south fast.