Cynthia Rylant 
Storm [EPUB ebook] 

Life with only the sea can be lonely. Just ask Pandora and Seabold. They’ve lived most of their lives with the sea–Pandora in a lighthouse and Seabold on a boat–and they’re each quite used to being alone. Or they were. But one day, the sea did something extraordinary: It brought Pandora and Seabold together! And even better, the sea gave them the ingredients for an adventure that neither of them had considered before-an adventure called "family."