Rusty and Audrey Griswold were famously played by a different actor in each of the National Lampoon’s Vacation movies, and that included some huge stars. The Griswold family’s patriarch and matriarch, Clark and Ellen, were consistently played by Chevy Chase and Beverly D’Angelo across the whole franchise — even in the 2015 reboot, two decades after the last movie — but the kids were always replaced with new cast members in each subsequent sequel. It practically became a running joke throughout the series that Clark and Ellen’s kids looked totally different and aged inconsistently from movie to movie.

Part of the reason for casting new actors as Rusty and Audrey in the National Lampoon’s Vacation movies is that child actors age a lot faster than their adult co-stars. Whereas Chase and D’Angelo looked more or less the same in the 14 years between the original Vacation film and the fourth one, Vegas Vacation,...