"Made up my mind to date both of them
by pretending to be TWIN brothers."
The Big Bang Theory Season 9, Episode 14
I grew up with an older brother
and a very contentious TWIN sister.
The Big Bang Theory Season 3, Episode 2
but when they're TWIN primes,
The Big Bang Theory Season 9, Episode 12
...since I beat out my TWIN sister
for the "Did It On The Potty" trophy.
The Big Bang Theory Season 8, Episode 23