yes
uh... that's weird
anyhow, that's not the case here
the translation is not entirely correct for the context
いとこのお姉ちゃん (itoko no onee-chan) does literally translated into "cousin's big sister"
But in Japanese, the phrase means "my cousin who is a girl and older than me"
I'll just put 
Itoko no Onee-chan ni Amaechau as an example