根据短文内容，判断下列句子正误。

Hello, everyone, I'm Xing Fei. I'm from China. My family name is Xing. I live in Beijing. My family is very large. In my family, my grandfather's father is the oldest one. He is now ninety-nine years old. My grandfather is eighty years old. And my grandma is eighty-two years old. They have four children, my uncle, my father, and my two aunts. I'm their grandson. My parents have two children, my sister and me. And I have four cousins. Now, I'm a student in No. 10 Middle School. And my sister is only five years old. My parents are both teachers. They love my family very much. So they work hard. We go to the park every morning. My mother says that it can help us keep healthy.