Charlie, 17, Parisa, 20, Mikey, 19, and Betsy Blue, 18, are like one big happy family and they all live together with Parisa's family.
"People see our relationship straight away," the group said. "It's like brother and sister. Four best mates. We're genuinely best friends for life."
It seems Only The Young have got the singing bug and belt out a tune anywhere they can, sometimes at the dinner table. In fact, they even compare themselves to the all-singing Von Trap family, which inspired Broadway musical The Sound of Music.
The group impressed the judges from the very beginning with their vocals and chemistry in the room auditions. The praise didn't stop there, as they continued to impress in the arena auditions, with Simon even saying that they could go all the way.
"It's not a job, it's not a hobby, it's not a career...it's our life," they continued. "You've got to embrace that. We spend 24 hours a day doing music."
Only The Young have had support from The Wanted, Union J and Harry Styles from One Direction (impressive!), so performing in front of Louis Walsh and guest judge Tulisa during the Judges' Houses in Bermuda was very important.
"Being here in Bermuda is incredible," they said. "The sun is bright, the sand is gorgeous, the sea is beautiful. We're enjoying every second but ultimately we're here to sing for a place in the live shows. Hopefully all the hard work pays off."
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Judges' Houses in pictures:
Copyright: ITV Syco / Thames TV