son Montgomery takes YOU on an unexpected adventure with your grandparents. Your 6-8 year old reader will make a zombie potion for Grandma and Grandpa, enter them in a scary costume competition, and go to the movies, the fair, and fishing! Choose Your Own Adventure Your Grandparents are Zombies! is an interactive adventure book in which YOU decide what happens next. Do you rescue Zombie Grandma from the ball pit? Or venture into the Haunted House with Zombie Grandpa? What if Grandpa eats the worms?