介绍自己的家庭短文表达 — 英语阅读题

阅读短文，回答问题。 Hello! My name is Peter. I have a big family. There are six people in my family. They are my grandpa, my grandma, my father, my mother, my little sister and me. My father likes cooking. My mother likes reading. My grandpa and grandma like walking in the park. My little sister is three years old. She is cute. I love my family. Question: How many people are there in Peter's family? Who are they?