If they can play guitars and a mandolin like that, you know they could play a banjo. My main instrument is euphonium but I can play trumpet, tuba, trombone, etc. I think they could do it!!
Those kids are awesome. But what was funny was the first comment. Saying they were totally bad *ss but they couldn't stand the one on the left with the sparkly leggins. That bothered them. Well, obviously the one on the left was a girl. How many boys do you see wearing leggings???