Sometimes I grumblesquinch

"Katie Honors is a really nice kid. But there's one little secret that sometimes makes her feel not-so-nice deep inside: her little brother, Chuck. Katie loves her brother and works hard to be the perfect big sister but it can be hard. Chuck can sometimes be just so icky and messy. Sometimes it makes Katie secretly wish she had a trampoline or a treehouse or a giraffe instead of a brother. When all these emotions bubble up to the surface, Katie can no longer grumblesquinch them down. She explodes, but she also learns an important lesson: that there's room for ALL of her feelings, even the scary ones"--Publisher.