Watching a fictional family on television every week for a few years, you might not notice just how much the actors literally grow up right before your eyes. It's gradual but by the end of a show's run, the actors who played siblings have totally changed and transformed, just like siblings do IRL. And when you see it right before you in photo form, well it's kind of crazy to see just how dramatically different everyone on the cast looks!
From the superhero siblings on The Thundermans, to a vampire and human sister and brother pair on The Vampire Diaries, to another duo who has some serious moves on the dance floor on Shake It Up, tons of on-screen families have gone through some major glo-ups. Not everyone has actual footage of themselves growing up year by year so when you think about it, it's actually kind of cool these actors have their television shows to look back on how much they've each changed.
Click through the gallery to see your fave fictional siblings' transformations!