I have both an older sister and a younger sister, so I often find myself saying:
我有一个姐姐和一个妹妹
Another possibility is something like
我是三个姐妹中中间的一个
But both very long winded. And this second one is hard to parse.
Question: What is the most succinct way of explaining that I have an older sister and a younger sister?
I'm thinking I could just say
我有两个姐妹
and whoever is listening would logically infer
- if I meant two older sisters, I would say 我有两个姐姐, therefore (since I didn't say that) it does not mean I have two older sisters,
- if I meant two younger sisters, I would say 我有两个妹妹, therefore (since I didn't say that) it does not mean I have two younger sisters, and
- therefore, the only remaining possibility is that I have an older sister and a younger sister.
But maybe it's only me that thinks like this.