MIAMI — Donning princess costumes and paper pirate hats, dozens of kids of U.S. Coast Guard members stationed in Miami surrounded first lady Jill Biden on Friday as she read them a children’s book about friendship. “What is the moral of the story?” Biden asked the group of about 120 children sitting on the floor of the hangar at the U.S. Coast Guard Air Station at the Opa-locka Executive Airport. “Be kind to others,” one kid answered. “I love that,” Biden responded. The visit was part of a listening session that Biden hosted with military spouses ahead of the “Blue Star Books” reading event, a…