answer: Mom asks Johnny to tidy up his room because his grandma is coming.
documents: #Person1#: Johnny, have you tidied up your room yet?
  #Person2#: Not yet, Mom. Why are you on such a cleanliness kick anyway?
  #Person1#: Do I have to remind you that your grandma is arriving tonight?
  #Person2#: Oh, my God, I forgot grandma's coming!
  #Person1#: Yes, so this place had better be clean. You know Grandma. . .
  #Person2#: . . . I know I'll be killed if I pee on the toilet seat.
  #Person1#: And Steve is going to look after you until we come back.