Taylor is Stefan Salvatore's daughter who he had when he was human but what everyone doesn't know is she is also a Mikaelson Her mother was the daughter of Klaus Mikaelson, she was killed when Taylor was a year old, Mikael had found her and killed her before Klaus even had the chance to save her He didn't know about his granddaughter until 2012 when he came to Mystic Falls to remove his curse but when he found her he saw how Stefan and Damon put Elena over her everytime