我的家人

你们好。

虽然我不认识明白很多汉语中文字但是我会争气去说和很好看中文也能够看得懂。我家人有四口人：我的爸爸，妈妈，双亲, 妹妹和我。父亲我爸爸是个邮递员。他在邮局工作，他给邮包。我的妈妈母亲是个护士。她很多工作很忙。我妹妹是个学生, 。她很聪明，她想要当医生。

1. 爸爸, 媽媽 are not wrong.  They are used by small little kids which I don't think you are.  They can be used by adults in intimacy settings which I don't see in this essay.

2.  You don't use first personal pronouns like "I", "My", "Me" etc when the context is clear.  It is never used before familial terms because these are precisely defined in Chinese from your view point.  To use them is redundant.  In Western languages, these terms are not defined precisely.  When you say "uncle", which one are you referring to, from the paternal or the maternal side.  Is he older or younger than your father?  Chinese have no such problem since we have special characters or terms for them.

我的家人

你们好。
虽然现在我不明白很多汉语的意思，但是我相信在将来我会说好中文说。（Though I don' konw many chinese words' meanning,I consider I will be good at it. ）我们家有四个成员：我的爸爸，妈妈，妹妹和我。（My family is consist of 4 members.my dad ,my mom,my sister and me）我爸爸是一名邮递员，他在邮局工作，他负责邮递包裹。我的妈妈是一名护士。她工作很忙。我妹妹现在还是学生，但她很聪明，她的志向是当一名医生。（My dad is a postman，working in post office.My mom is a nurse,and she is very busy.my sister is smart,and she is a student.u know ,she want to be a doctor in the future.

我的家人

你们好。
我不明白很多汉语(“的意思”adding this part in is better)但是我尽量争取说好和看懂中文（actually,i don`t understand what you want to express in the last part of this sentence）。我家人有四个成员：我的爸爸、妈妈、妹妹和我。我爸爸在邮局工作，他负责送包裹（from“我爸爸是邮递员”to“他邮递包裹”are repetitive，all of them mean the same thing in Chinese, ）。我妈妈是护士（“的”can be deleted，“我妈妈”have already been a whole part），她的工作量很大（expression in this way is better）。我妹妹是学生。她很聪明，（“她” can be removed）并且想要成为一位医生（“当医生”is more like oral speaking；“并且”is a conjunctive,just as "also、and")。