阅读理解。
There are five people in my family. They are my grandmother, my father, my mother, my sister and I.
My grandmother is very old. She is eighty years old. My father is a businessman. He is very busy (忙绿的).
My mother is a nurse. She works in a hospital. My mother is younger than my father. My father is taller than
my mother. My sister and I are students. We are in the same school. She is younger than me. She is ten years
old. I'm twelve years old. We often help each other (互相).
根据短文内容，回答下列问题。
1. How many people are there in my family?
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2. How old is my grandmother?
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3. What does my father do?
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4. Is my mother younger than my father?
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5. Is my sister a nurse?
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