在幼儿园英语中，家人通常用以下词汇来表示：

Father: 爸爸（dad）
Mother: 妈妈（mom）
Grandfather: 爷爷（grandfather）
Grandmother: 奶奶（grandmother）
Brother: 哥哥（brother）
Sister: 姐姐（sister）
Uncle: 叔叔（uncle）
Aunt: 阿姨（aunt）

例如，你可以用以下方式介绍你的家庭成员：

"This is my father. His name is John. This is my mother. Her name is Mary. I have a brother and a sister. My brother's name is Tom and my sister's name is Kate. I also have an uncle and an aunt. My uncle's name is Bill and my aunt's name is Sue."

希望这能帮到你！