"My family has four people" 可以用英语表达为 "There are four people in my family."
来源："My family" 是指自己的家庭，"has" 表示拥有，"four" 表示数量为 4，"people" 表示人。
英文例句及其中文翻译：
"My family has four members" (我家有四口人)
"There are four people in my household" (我家有四口人)
"My family consists of four individuals" (我家有四口人)