Girl Named Tom made history on on Tuesday night, as the first group ever to win the NBC singing competition — but the victory was bittersweet.Just after being declared the winners of season 21, the sibling trio from Ohio -- Bekah, Joshua and Caleb Liechty — shared a moving letter thanking fans for their support throughout the season, and revealing a heartbreaking update about their father's battle with terminal cancer.«Not only have we made history together, you've helped fulfill three siblings' dreams and encouraged us to keep dreaming big,» the letter read, in part. «You've embraced the people we are and the music we've created, affirming our belief in ourselves and what we do.
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