Addison Grace Costello (born April 7, 2001) is the sixth child of Dale and Amy, younger sister to Logan, Carley, Chaslyn, Joelle, Corban and older sister to Nolan, Bryson, Cameron, Keaton Costello.

She looked rather teary at the dining table, when Corban wrote a mean note about her. An apparently well-behaved child, she is seldom seen in this episode.

She was 7 when she appeared on Supernanny and is now 16 in 2017.

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Addison's birth record