Kristin Minter as Heather McCallister
As the eldest sibling in the McCallister family, Heather McCallister shoulders significant responsibility for keeping her younger siblings organized. This responsibility becomes evident during the chaotic rush to prepare for the airport in the morning, where Heather is tasked with ensuring that all the kids make it into the van.
However, a critical error occurs when she mistakenly counts a neighbor's boy, thinking he's Kevin. This moment of miscalculation becomes the crucial mistake that leads to Kevin being left behind at home.
