Harmony bred right into them.
Their mother writes:
One of my daughters heard the National Anthem being played as an instrumental piece at a prior track event and she was very unsatisfied with this. She felt it should be sung so she reached out to her teacher and asked if she and her siblings could sing it together for the next track meet. They agreed to it and it's been a whirlwind since last Thursday. We taped it and have received very favorable response since. We have been attending the Midwest Vocal Express chorus concerts here in the Milwaukee area, and my kids just love barbershop. I wanted to share it with you because it has been such a blessing to many people. They put this together themselves within two days with relatively limited coaching. They have a knack for harmony and are working to refine the harmonies even more. We hope that you're blessed and encouraged to see young people enjoying singing harmony and honoring our country! We hope to visit the National Barbershop Society next time we are in Nashville.