Read the text and answer the questions There are four people

Read the text and answer the questions

There are four people in Tam's family, his parents, his sister and him. Tam's father is an engineer. Everyday he goes to work at 7 o'clock. Tam's mother is a doctor. She works in a hospital in the town. She goes to work at 6.30. His sister is a student at Hanoi National University. She is twenty years old. Tam is twelve. He is a student at Quang Trung School

How many people are there in Tan's family?