Read the following passage and answer the questions that follow:
The young seagull was alone on his ledge. His two brothers and his sister had already flown away the day before. He had been afraid to fly with them. Somehow when he had taken a little run forward to the brink of the ledge and attempted to flap his wings he became afraid. The great expanse of sea stretched down beneath, and it was such a long way down - miles down. He felt certain that his wings would never support him. Even when each of his brothers and his little sister, whose wings were far shorter than his own, ran to the brink, flapped their wings, and flew away, he failed to muster up courage to take that plunge which appeared to him so desperate.
Who had flown away the day before?

Explanation

His two brothers and his sister had already flown away.