Who inspired the character of the grandma in the witches?

The character of the grandma in Roald Dahl's "The Witches" was inspired by Dahl's own grandmother, who had a significant impact on his childhood. He often recounted stories about her, particularly her wisdom and the way she engaged him with tales of witches and folklore. This personal connection adds depth to the character, making her both relatable and memorable in the narrative. Dahl's affection for his grandmother is evident in the warmth and humor he imbues in the character.