Cassidy Mackey was the oldest daughter of Vic and Corrine Mackey. She had two younger siblings: Matthew and Megan. A pre-teen during Season 1, and her parents break-up, Cassidy grew up developing issues against her parents. As she became a teen, she lashed out constantly at both Vic and Corrine. At the end of the show, she seemed to have settled down and took care of her younger siblings.