Bestselling author-illustrator team Laura Numeroff and Lynn Munsinger celebrates all the wonderful things brothers and sisters can do together in this delightful flip book. From climbing trees and sharing snacks to playing sports and making music, readers will delight in all the fun antics these siblings enjoy together. After reading what brothers do best, simply flip the book over and enjoy the story again - from a sister's perspective! With charming mirrored text and adorable illustrations, this exciting follow-up to the bestselling "What Mommies Do Best/What Daddies Do Best" and "What Grandmas Do Best/What Grandpas Do Best" is sure to appeal to any child who has - or wishes for - a brother or sister to play with.