Come on!' he muttered, staring about. 'Where are you? Dad, come on--" But no one came. Harry raised his head to look at the circle of dementors across the lake. One of them was lowering its hood. It was time for the rescuer to appear--but no one was coming to help this time-- And then it hit him--he understood. He hadn't seen his father--he had seen himself--... 'It was stupid, thinking it was him,' he (Harry) muttered. 'I mean, I knew he was dead.' 'You think the dead we loved ever truly leave us? You think that we don't recall them more clearly than ever in times of great trouble? Your father is alive in you, Harry, and shows himself most plainly when you have need of him. How else could you produce that particular Patronus? Prongs rode again last night.'... 'You know, Harry, in a way, you did see your father last night...You found him inside yourself.' And Dumbledore left the office, leaving Harry to his very confused thoughts.
J.K. Rowling, Harry Potter and the Prisoner of Azkaban
courage, parents