
...since I beat out my TWIN sister
for the "Did It On The Potty" trophy.
The Big Bang Theory Season 8, Episode 23

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

The Crown and the Faith
are the TWIN pillars of the world.
Game of Thrones Season 6, Episode 3

but when they're TWIN primes,
The Big Bang Theory Season 9, Episode 12

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