Madam Mim's Granddaughters are mentioned in The Isle of the Lost. They seem to have hook noses and it states they are witches. There are at least three of them looking at Jay in one of the first chapters of The Isle of The Lost. In Descendants: Return to the Isle of the Lost, its revealed that one of the granddaughters is named Mad Maddy.
- They were introduced in chapter two of Descendants: Isle of the Lost.