At 18 years old, singer Sydney Sierota is still adjusting to adult life, which makes sense because her band has been moving at lightspeed. A few years ago, Echosmith were hammering out covers on YouTube. Today, they're ringing Nasdaq bells and lighting up the Times Square big screen.

As Echosmith, Sydney and her three brothers—Graham on drums, Noah on bass, and Jamie on guitar— careened into view following the success of their 2x platinum hit `2013 single "Cool Kids." And now, as they recalibrate to the world of international touring, they're taking comfort in knowing that they have their closest loved ones on the road.

On the latest episode of Roadhouse, we follow the band around New York City, onto the trading floor, into soundcheck, and backstage before their big show to talk family ties and hitting it big.