Books in Young mermaids series

Down in the watery blue depths of the ocean is Tingle Reef - home to young mermaid Rani and a whole host of fishy friends! It's an underwater world of magic and mystery - where Rani's adventures are about to begin...Rani has discovered where she comes from - with the help of Morva, the sea witch. But when she reaches the sea volcano where she was born, there's a big surprise waiting for her - she's got a brother! And if her brother is the shell prince - who is the shell princess? A hugely appealing trilogy of mermaid adventures for younger readers.