Hello everyone,My name is 刘泽华I’m from a small city in northern China.Maybe you can call me: Bruce This is my English name.
  My family has 4 peoples They are my father my mum and my little brother My brother ,I can’t figure out what he’s thinking every day.After all it’s a child haha I like it very much

Hello everyone. My name is 刘泽华. I’m from a small city in northern China. Maybe you can call me Bruce. This is my English name.
I'm in a family of four: my father, mum, and little brother. I can’t figure out what my brother is thinking every day. After all, he is a child haha. I like it very much.

Hello everyone! My name is 刘泽华 and I’m(/I come) from a small city in northern China. You can call me "Bruce." It is my English name.
We are 4 in the family - my father, my mum, my little brother, and me. I can’t figure out what my little brother is thinking every day. After all he's (still) a child(/baby) haha. I like like him very much.