Teddy Duncan is Kaz's highly intelligent cousin. She looks exactly like her father's great-great-great-great-great-great-great-great-great-great-great grandmother's sister, Juliet Van Heusen, who recently died. Following her divorce from Spencer, Teddy has been dating Juliet's husband, Justin Russo. Teddy is 1\15th vampire. Her cousin Katie looks like her.

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