Regan McCallister is Kevin's older sister by 3 years. So, that would make her 13. The girl is can be a little spooky at times, plus, she usually wears black. She even dyed her hair black! In all, she's what you call a goth girl + a "stay-at-home" kind of person. That's why the eighth grader wasn't exactly thrilled about a family vacation to Florida. Besides, since it worked out so well the last time, why not do it again? Despite all of this, she still somehow cares for her family, especially Kevin. Because of this, the two will end up in New York instead, and get lost together.