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The family relationship between former-Enhanced Original Vampire-turned-human, Alaric Saltzman and tribrid-doppelgänger, Alexandria Gilbert.
Alaric became Alex's new history teacher following Mr. Tanner's death. Shortly afterward, Alaric began dating Alex's aunt, Jenna, and the two slowly became allies after she discovered he was a vampire hunter. They grew very close, especially when they discovered that Alaric's "dead" wife, Isobel, was Alex's biological mother. When Jenna died, Alaric moved in with Elena, Alex, and Jeremy and took the role as their new guardian. When Esther turned him into an Original vampire, Alex was heartbroken, and they shared a final hug.