Why doesn t Berra have a grandfather? And how can he get one?There are plenty of old men at the retirement home, Ulf suggests. They go there together to find one ideally one who eats pig s trotters, invites you to tea and can teach you to whistle. Can You Whistle, Johanna? is an international award-winner and classic in many countries by one of the world's great writers. Best Middle-Grade Fiction 2021, Kirkus.