
She's my TWIN sister.
The Big Bang Theory Season 1, Episode 15

Penny, this is Sheldon's TWIN sister.
Missy, this is our neighbor Penny.
The Big Bang Theory Season 1, Episode 15

are the TWIN pillars
upon which the world rests.
Game of Thrones Season 6, Episode 6

I grew up with an older brother
and a very contentious TWIN sister.
The Big Bang Theory Season 3, Episode 2