"Beezus and Ramona" by Beverly Cleary

Having a little sister like four-year-old Ramona isn’t always easy for Beezus Quimby. With a wild imagination, disregard for order, and an appetite for chaos, Ramona makes it hard for Beezus to be the responsible older sister she knows she ought to be…especially when Ramona threatens to ruin Beezus’s birthday party. Will Beezus find the patience to handle her little sister before Ramona turns her big day into a complete disaster?