You’ll Be Sorry by author/illustrator Josh Schneider is a cute tale about why you’ll be sorry if you do something naughty to your little brother or sister. Let’s be honest, parents, how often have you said “You’ll be sorry if you …”? But why exactly will the child be sorry? My parents always said that I’d be sorry because my brother would grow up to be bigger than me. I was four years older, so that wasn’t an immediate incentive.