article: My name is Helen. I'm seven. Dale is my brother. He's eleven. We are in the same school.
  My mother is a teacher. She teaches English. She is a teacher in our school.
  My father is a doctor in a big hospital. I have a dog. Its name is Ben. We are good friends.
question: Dale and Helen are   _  .
options: brother and sister friends students both A and C (both ...and )