Waiting for a new baby is hard, and waiting for her to grow up into a playmate is even harder. Luckily Liam's Nana is just downstairs and always ready to help. When the two of them build a Get-Older-Faster Machine, Liam is surprised to find it's not Sophie who does the most growing up. Waiting is hard. Liam waited through half of kindergarten for his baby sister to be born. Then, when little Sophie finally comes home, he...