Daisy's older brother is thrilled when he gets a baby brother.

They are best buddies who do everything together. But then, his younger brother realizes she is a girl and wants to be called Daisy.

Daisy's brother must adjust to the change - including what it means for him and their sibling relationship.

A moving, lyrical picture book based on a true story, My Sister, Daisy handles a sensitive subject with warmth and love.