Popsugar Family Siblings What Are Bookend Babies? Cute Photos of "Bookend" Siblings That Prove You Shouldn't Be Too Worried About Big Age Gaps April 6, 2020 by Alessia Santoro View On One Page Photo 18 of 18 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 18 Previous Next Start Slideshow SiblingsPhotographyParenting