小升初英语作文中介绍家人时，通常需要包含以下内容：

1. 家庭成员构成

   用简单句式介绍家庭成员，如：

   • "There are four people in my family. They are my father, my mother, my brother and I."

   • 注意使用"family"作为核心词汇，并区分直系亲属（如父母、兄弟姐妹）和旁系亲属（如祖父母）。

2. 职业与工作描述

   简单说明家庭成员的职业，例如：

   • "My father is a computer engineer. He works in a big company."

   • "My mother is a nurse. She always comes home tiredly after work."

   • 使用"work hard"、"care much"等短语体现家庭成员的付出。

3. 家庭关系与互动

   描述家庭成员间的互动，如：

   • "My brother is three years older than me. He helps me with my studies."

   • "We live a happy life. Although my parents are busy, they always support me."

   • 通过具体事例展现家庭温暖，如共同旅行、节日庆祝等。

4. 写作建议

   • 使用一般现在时描述习惯性动作（如"walks with friends every day"）；

   • 注意语法正确性，如避免"es home"应为"comes home"；

   • 结尾可表达对家庭的爱（如"So do they"）。

示例作文 ：

"There are four people in my family: my grandmother, my father, my mother and me. My grandmother is easygoing and walks with friends every day. My parents are doctors at the same hospital； my father works in a big company, and my mother is always busy helping patients. My brother, who is three years older, is a middle school student and helps me with homework. We live a happy life, and I love my family very much."

以下是一篇小升初英语介绍家人作文的例子：

My Family

I have a happy family. There are four people in my family: my grandfather, my grandmother, my father, my mother and me. My grandfather is 73 years old. He has short white hair and wears glasses. He likes reading newspapers and playing chess. My grandmother is 68 years old. She has short white hair too. She likes knitting and watching TV. My father is 45 years old. He has short black hair and big eyes. He is a doctor in a hospital. My mother is 42 years old. She has long black hair and big eyes too. She is a nurse in the same hospital. I am 12 years old. I have short black hair and big eyes. I am a student in a primary school. We all love each other and live a happy life.

这篇作文介绍了作者的家人，包括祖父母、父母和自己。每个家庭成员都有详细的描述，包括年龄、外貌特征和兴趣爱好。作文语言简洁明了，表达了作者对家庭的热爱和幸福生活的感受。