In the video, posted to Youtube in December 2014, the older brother plays the guitar and lets his younger brother take the lead on the vocals. It's an absolutely precious moment that their mom was lucky enough to get on video. With a strum of the final chord and a high five, they bring their brotherly bathroom jam session (the bathroom has the best acoustics, as any musician--or shower singer--will tell you) to a close.
Watch the video below.