The series is based on her own childhood .
The series is was illustrated by her then twelve - year - old daughter , Mina May , making her one of the youngest professional illustrators in the world , with four published books to her name .
The series is based on her own childhood and was illustrated by her then twelve - year - old daughter , Mina May , making her one of the youngest professional illustrators in the world , with four published books to her name .