Twins have very high-pitched argument... but you’ll never guess what they’re fighting over

Contrary to popular belief, when it comes to twins it's not always happy families and BFFs – and these sisters are a prime example!

While we're sure they are friends most of the time, this video posted to YouTube shows the girls arguing – in very high-pitched tones – over a car seat.

And while we haven't a CLUE what they are saying, they definitely understand each other, and it even gets very heated at one point when the little girl climbs into the chair.

We know we shouldn't be laughing, but the way they communicate is both hilarious and fascinating.

Share with your own sister and give her a laugh.