The concept of the book is simple: Each page has a prompt that your grandkid fills in, including things like, “I love how you always say __” and “Your __ is the best __ ever.” It’s perfect for kids who are too young to write long cards on their own, or even for older kids who find communicating hard. And it’s a great project for each grandparent and grandchild to do together as a gift for the other grandparent. knockknockstuff.com.