在家里有爸爸妈妈和妹妹，可以说 "I have a father, a mother and a younger sister in my family."

其中 "father" 是 "父亲" 的意思， "mother" 是 "母亲" 的意思， "sister" 是 "姐妹" 的意思， "younger" 是 "年轻的" 的意思。

翻译例句:

I have a big family, my parents and my two younger sisters pve with me.
我有一个大家庭，我的父母和我的两个妹妹和我住在一起。

My sister is the youngest in the family, she has an older brother and parents.
我妹妹是家里最小的，她有一个哥哥和父母。

I come from a small family, just my mother and father and my younger brother.
我来自一个小家庭，只有我的父母和我的弟弟。