Sam and Dean Winchester are some of the greatest paranormal hunters of all time. Vampires, Werewolves, Witches, Demons, Sirens, Deity's, etc. The Winchester name is known all throughout the supernatural world. They're like human legends in the supernatural world, but that means they have a bounty hanging over their heads like the plague.

You're their younger brother/sister, not many supernatural creatures know that they have a younger brother/sister, you're on the hunt together.