What if when Sam was 8 and Dean was 12 their dad got a woman pregnant with a girl. The woman mysteriously died when the girl was 4 and was sent to John. John sent the girl to Bobby. The girl's name is Sydney Winchester, and she is the best damn hunter in America. I OWN NOTHING BUT SYDNEY!!! EVERYTHING ELSE BELONGS TO SUPERNATURAL!!!

Sequel

Sydney's mom is marrying Tom, the rich man with 6 sons. What happens? Even I don't know.