Rascal Flatts star sings with his son. And it's adorable.

Rascal Flatts bassist and harmony vocalist Jay DeMarcus stunned the crowd at Harbour Town in Hilton Head this Independence Day with a surprise guest performance.
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Rascal Flatts bassist and harmony vocalist Jay DeMarcus stunned the crowd at Harbour Town in Hilton Head this Independence Day with a surprise guest performance.