A little boy is convinced that his grandmother is a fairy and tries to prove it.
- Genre: Juvenile Fiction
- Subgenre: Fairy Tales + Folklore / General, Family / Multigenerational, General
- Publisher: Luis Vives Editorial
- Pages: 48
- Language: Spanish
- Format: paperback
- Release Date: January 15, 2009
- Date Published: January 15, 2009
- Author: Ana Tortosa
- Illustrator: Lucia Jalon Oyarzun