A Witch and the Winchesters.

Marz, Bobby Singer's adopted son is a witch. He's been practicing magic since we was taken in at 14 years old, his past not the best for a kid his age. Neither was the realization that his adopted father was one of the most famous supernatural creature hunters. Marz was in and out of families who decided to give him up was nothing a kid should ever go through. His past was dark to say the least.

Sam and Dean Winchester, sons of John Winchester. An infamous hunter of the supernatural just like Bobby, John wasn't a father any kid needed. He was neglectful and stone cold after his wife Mary passed away while they were both young. He turned his kids into soldiers, only succeeding with Dean the oldest. Sam didn't want the life. So he left.

Years later, Dean travels up to Stanford. The college Sam ran off to in attempts to have a normal life with his girlfriend Jess, attempting to become a Lawyer. John is missing. So Sam and Dean try and hunt him down. While attempting to, they meet Marz.

That night in Bobby's study is the start of many years together, the three of them against the supernatural creatures of the world.