When Theo and his mother, Simone, become part of Lula's family, she isn't sure what to expect. As they all spend a holiday at the seaside, the new siblings learn to work together to create a beautiful sandcastle. But once disaster strikes, will their relationship weather the storm?This beautiful picture book by Júlia Moscardó explores the challenges and joys of forming a new family and gaining a sibling. With evocative illustrations and beautiful text, this book will immerse your little reader in the world of the seaside and in the ups and downs of forming new friendships.