阅读短文，选择正确的答案。

    I am Jenny. I am 10 years old. I have a big family. My grandparents are old. But they do exercise every day. They're healthy. My parents are both teachers. I have a brother and a sister.

    My father has a brother. He lives in Beijing. He is a fireman. He is very busy. He can help people. I think he is a hero. I have a cousin—Charlie. He is my uncle's son.

    My mother has a sister. She is a doctor. She has two children. They are Lucy and Tom.