Having a sibling isn't just fun. What if that kid just screams and screams, and your mom and dad still like it? Peter is afraid that they like his little sister more than him. He regrets wishing himself a sibling Why didn't he wish for a tricycle instead?The picture book I want a sibling was originally published with pictures by Birgitta Nordenskjöld, later editions are illustrated by Ilon Wikland.