Ava is the newly adopted daughter of Stefan. Before going to back to Mystic Falls, Stefan was living in New York. He often walked by an orphanage and would see Ava. After meeting and talking to her a couple of times, he adopted her. Not long after adopting her, Stefan went back to Mystic Falls. Ava knows that Stefan is a vampire because he told her. Face claim for Ava: Madison Pettis