"He has little hair because he thinks a lot. He is a very clever man." Helen says with a smile.

They have a son. His name is Peter, and he is five years old.

Jack is not old, but he does not have much hair. His wife Helen has thick and black hair.

One day, Jack is reading a book in his room. Peter looks at his father for long time and says to his mother, "Why does father have so little hair, mum?"