The Winchester Three (S1): The Beginning

Angel Millie Winchester, eldest of the Winchester clan, had to grow up exceptionally early at the age of 6 to help care for her brothers (4 year old Dean and 6 month old Sam) after their mother was murdered by a Yellow Eyed Demon. She's blossomed into quite the spitting image of her mother, as well as one of the best hunters there is thanks to her father, John Winchester. When their father goes missing during a hunt, Dean and Angel link up with their hunter-retired law school bound brother Sam to find him as well as hunt and kill every supernatural creature they come across.