The following text is for questions 21 to 25.
 

    Once upon a time, there lived a Cloud family. Papa Cloud, Mama Cloud and the Cloud children lived quietly in the sky.

    Every morning, the Cloud children went to the sky playground to play on the slide. Since there was only one slide, they had to take turns on the slide. Lady, the youngest Cloud child , looked impatient. He could not wait for his turn to come. His brother, Tody, didn't like his attitude. Suddenly, they quarrelled . Their white bodies became grey. It meant they were very angry. When the clouds were angry, water usually came out of their bodies. It meant rain for the people on Earth .

    "Stop it, children! Stop fighting!" Papa Cloud said.

   "You can play on the slide in turns. Now, shake hands. Both of you!" ordered Papa Cloud.

    Lady and Tody shook hands and slowly their colours changed. Their bodies
became fair and white again. The rain stopped and people on Earth could go on with their activities again.

Who are the characters in the story?