To Grandfather's House We Go is the seventh episode of David the Gnome.
David's granddaughter, Susan is coming for a visit. But in a deep part of the forest there lives a real witch with her cat. When the witch leaves for the day, her cat goes wandering in the woods. Lisa goes to pick up Susan, and they meet a friendly porcupine family. The cat spies the gnome house. Knowing the gnomes have mice as pets, he tries to get into David and Lisa's house, but he falls into their trap designed to catch small animals. Later that evening, David lets the cat out. The cat gets scared of Swift and runs back home. That night the witch comes home and listens to the cat's adventures. This inspires her to write a story, "Little Red Riding Hood".