Talitha has grown up raised in the hands of The Winchester brothers and another hunter by the name of Jen Dobson, along with her "brother" Nathan, Both her and Nathan are Nephilim, The forbidden children of angels and humans. Nathan is The child of Jen and Balthazar while Talitha's mother died in child birth and she doesn't know who her father is...her oldest is memory is of Castiel and the boys and none of them have ever mentioned her dad. All that she knows, is he's an angel. And when Cas, goes missing after trying to open Purgatory Talitha is left without a father figure and she refuses to confide in Sam and Dean, not even Nathan. All her life a voice in her head has called out to her and all that time she assumed it was some angel trying to kill her, but in a desperate time of need she follows that voice and he reveals himself to be her father...and her father just happens to be A trickster ;)