Paola Forti Book order (chronological)

George's Grandma is a grizzly, grumpy, selfish old woman with pale brown teeth and a small puckered up mouth like a dog's bottom. Four times a day she takes a large spoonful of medicine, but it doesn't seem to do her any good. She's always just as poisonous after she's taken it as she was before. When George is left to look after her one morning, it's just the chance he needs . . .

How do you outwit a Twit? Mr. and Mrs. Twit are the smelliest, ugliest people in the world. They hate everything -- except playing mean jokes on each other, catching innocent birds to put in their Bird Pies, and making their caged monkeys, the Muggle-Wumps, stand on their heads all day. But the Muggle-Wumps have had enough. They don't just want out, they want revenge.