Luisa is the half-sibling of Sam and Dean Winchester. You were 17, Sam and Dean found out by the old diary of their dad, John Winchester. Of course they told Castiel, Bobby...Jody, Charlie, Jack was there too. One day they got a case and turns out you were a victim...After they saved you from rouge ghouls they told you all the truth...and you were shocked at the start...and you told them that you were pregant...that made your big brothers even more protective of you. They decided to take you to the bunker were you knew Castiel and Jack...and their friends too.