大家来看看我的作文有语法毛病吗？

我是个小学生，英语学得不好~

大家看看我的作文有什么毛病啊？

My family
Hello! my name is Sansan .Ihave a happy family. There are four people in my family .My father my mother my brother and i .My father is a doctor,he can wark regardless of external trivialities. My mother is a gymnast,shi is very beautiful . My brother and i are students ,we are in the same class .This is my family,what a good family i have!

My father # my mother # my brother and i 在#处应加逗号

其他并没有什么语法错误