It's a branch of philosophy
RELATED to linguistics.
The Big Bang Theory Season 1, Episode 5
All right.
Is my pole flag RELATED?
The Big Bang Theory Season 9, Episode 15
Oh, hey, on a RELATED subject...
The Big Bang Theory Season 3, Episode 6
Are you sure we're not RELATED?
Game of Thrones Season 4, Episode 1
What makes us believe
that someone RELATED to the gang
Money Heist Season 1, Episode 8