How do you call older/younger brother/sister when they are twins?
I have studies Mandarin for years in Holland and Taiwan and I know

- gege (older brother)
- didi (younger brother)
- jiejie (older sister)
- meimei (younger sister)
- dage (oldest older brother)
etc

But what about twins?
Example:
Suppose I have 2 older sisters and they are twins. Which will be my dajie?

Thanks for your response.

Question

How do you call older/younger brother/sister when they are twins?
I have studies Mandarin for years in Holland and Taiwan and I know

- gege (older brother)
- didi (younger brother)
- jiejie (older sister)
- meimei (younger sister) 
- dage (oldest older brother)
etc

But what about twins?
Example:
Suppose I have 2 older sisters and they are twins. Which will be my dajie?

Thanks for your response.

Answer

現代的原則是依照 出生次序 而定
與是否為 孿生 無關

不過 在古代 曾有討論 先出生者應為弟(妹) 後出生者則為兄(姐)
因為傳統的計算年齡方式是 從受胎的那一刻起算 (稱為 虛歲)
又依 上位為尊 下位為卑 的空間觀念 
攣生兄弟在母親子宮裡 早已經定好了次序
在子宮上方的為兄 在下方的為弟
下方者先出生為弟 
上方者後出生為兄

Answer

u have two older sisters.
u are C and they are A and B.
A is older than B.
here it is:
A is your 大姐（dajie）
B is your 二姐（erjie）
if u have more, u can continue: 三姐（sanjie） 四姐（sijie）.............
if they are brothers: 大哥（dage） 二哥（erge） 三哥（sange） ..............

very simple

:D

Answer

the concept of twins in China is one who showed out first is eternal 哥哥 and the one who was taken out later is 弟弟

they aren't equal twins