NEW BRITAIN, Conn. — As Hurricane Maria churned toward Puerto Rico, Joseenid Martin Gregory put her sons Eliot Saez Martin, 9, and his brother, Elionet, 5, on a plane to be with their grandfather in Connecticut, fearing their lives could be in danger if they stayed on the island. As the scale of devastation became clear, and the boys’ grandfather found no way to communicate with his daughter, he made arrangements to keep the boys here indefinitely.