Susan: My son got accident at school. The teacher called me just now.
Jane: Oh my god! What happened?
Susan: I don’t know much. Mr. Smith said he turned on the music and let students dance in a class activity. While they were dancing, Bob fell down and knocked his head. Now they sent him to the hospital. I have to go now to see him there.
Jane: OK, don’t worry, I’ll take care of your work and tell the boss for you. Bob is a strong and smart kid. He’ll be fine.


Whose son is at the hospital?