How to write cousin's composition?

My cousin, I have a sister. She is my cousin. Her name is Yang Yilin. We all call her Linlin. She is nine years old. It's cute, so it's very likable. My cousin is eloquent and eloquent. She quarreled with others and won again and again. Neighbors said that she would study hard in the future. However, unexpectedly, last year, she couldn't keep up with the first volume of primary school. I look for reasons for her. First, my aunt and uncle spoil her so much that everything is left to my cousin. Second: My aunt and uncle are lax in discipline. My cousin can play whenever she wants and watch TV whenever she wants. Every time I do my homework, I drag my feet, cram for it, or even finish it. There is no movement at all. Third: Cousin didn't pay attention to study. Sometimes praised by teachers, too proud. As soon as I get home, I will talk about this and that. She always thinks that what she thinks, says and does is right and never cares about others. Linlin is also good at deceiving others. Once, she got full marks in the exam, and all the teachers in the school praised her. She was so happy that when she got home, she shouted, "Mom, Grandpa, Grandma, Dad, Sister ... I told you that I got a hundred points in the exam and the teacher praised me! Do you think I am strong? " At this time, if we don't talk well, she will hide under the table and won't get up no matter what we say. So I can only say: awesome. I asked her again, "since your academic performance is so good, why don't you hang two pens on your shoulder?" "The teacher hasn't finished sending it yet!" I feel very strange: it's almost the end of the term, why hasn't my sister's teacher finished sending it? Oh, so she's lying to me. How could I forget that she is a master liar!